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In this lecture, we're going to start adding some background music for our game.

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And the first step for this is to find some music for our game.

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So I've gone over to open game dot org, which is a fantastic resource for indie developers.

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And if we head up to browse and then down to music, we'll have a whole bunch of music that we can choose

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from.

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Now we can narrow down our search with the search parameters on the left here.

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So first of all, I'm going to narrow down my license to look for CC zero.

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So copyright free, we want some music as our art type.

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And if we have a rough idea of what sort of thing we're looking for, we may want to narrow down our

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search even further with themes and things like that.

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I actually got pretty lucky though, when I was listening through some of these tracks and in the very

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first one in Chip Tunes Action, I found some pretty cool music for my game.

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And the great thing about this site is that we can also preview our music before we download it.

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So we just hit the play button and we can hear our music and this sounds pretty epic for a space battle,

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so I'm going to go with that track and if we scroll down, we can select our files down here and we

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can download our zip file.

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Once we've downloaded that, we need to import it into our project.

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So I've dropped mine in the assets pack.

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So we've got our five action chip tunes in here and we can also preview them in Unity.

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So if we click on one of our tracks and go down to the preview window, if you don't see the preview

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window, it might be closed up down the bottom like it is here.

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All we need to do is just drag it up.

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Now we can go ahead and hit the play button.

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And here's one of those other tracks from that hack.

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Now, before we start adding this music to our game, I've noticed that our asset pack is starting to

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get a little bit messy.

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We've got some materials in there in various places, so let's do a quick bit of housekeeping.

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I'm going to right click and create a new folder for our backgrounds and we'll drag the star filled

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Star Zero and stars one into that.

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And then in the assets folder, I'm going to create a new folder specifically for our materials that

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we've been creating.

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So in here we had the background so we can drag that in.

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And in our space shooter folder we also had our M explosions.

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So let's drag that into the materials folder as well.

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That just makes them nice and easy to find and separates them away from the asset packs that we've been

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importing.

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So that's the housekeeping done.

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So now let's go over to our audio player and see what we did.

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Last Lecture.

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We created this audio player script, which held a audio clip to be played and specified the volume

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that we wanted to play it.

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And if we open up our audio player, then we were using this audio source play clip at point.

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But for our music, we don't really want this one shot audio.

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We want it to be continuously playing in the background.

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So let's get a better idea of how unity actually handles music in our game and understand what this

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audio source actually is.

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Well, the audio in Unity really comes in three parts.

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First of all, we need an audio listener, which is the thing that will allow us to hear the audio.

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And you may be wondering where that was sitting when we were doing this one shot audio and I'll show

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you where that is when we go back into Unity in a moment.

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Next, we need an audio source to play our audio.

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So that was that audio source play clip at point.

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And again, I'll show you where that was sitting with our one shot audio.

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And finally, we need an audio file.

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So the actual sound that gets played, so if we follow the arrows here, we have our audio file feeds

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into our audio source and our audio source gets listened to by our audio listener.

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So let's jump back into unity and I'm going to hit play and pause very quickly.

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And if we play to the point where we have our laser being instantiated, we'll see that we've got this

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one shot audio clip.

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And if we click on that one shot audio, we'll find our audio source without audio clip attached.

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So we were passing that audio clip from our audio player over to this audio source.

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And the listener for this audio source actually sits on our main camera.

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So if we look on our main camera, right near the bottom, we've got this audio listener.

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And that's why when we were playing our one shot audio, we were telling it to play at the camera position

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for the clearest sound.

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So if we come out of play mode and go back over to our audio player, let's have a think about how we're

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going to play our music well rather than mess with the audio player.

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For now, let's go ahead and add a new component to this game object.

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And the component we want is an audio source.

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Now, this audio source has a lot of bells and whistles and levers that we can pull.

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And it may be a little bit overwhelming unless you've done any audio engineering in the past, but for

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us we can actually ignore the vast majority of what's going on here.

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We're going to be playing two D sound, so everything in this three D sound setting can be completely

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ignored.

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So we'll just roll that up.

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And the only things we're interested in is our audio clip, which is the thing we want to play.

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So let's go over to our audio and drag the clip.

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We want into the audio clip.

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We don't need to worry about the output and we can see here that it's expecting an audio mixer.

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It's a bit overkill for our game though, so we really don't need to worry about that.

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We have a mute option so we can mute and unmute our audio.

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We don't need to worry about any of the bypass effects for our music.

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We will want it to play on Awake.

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So the moment the game starts, the music will start with it.

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But if we wanted to manually trigger our audio to play, then we could turn that off and then control

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that in code.

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And then finally for our checkboxes, we have a looping option and our music wants to be able to loop

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continuously through the game.

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So let's enable that and hopefully for your music that you found.

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It is a looping tracks.

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There won't be any hard cuts between the beginning and the end, then down onto our sliders.

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We don't need to worry about the priority or the pitch or the stereo plan or any of that stuff.

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The only thing we really care about is the volume.

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So that's our normal volume slider like we've added to our audio player and we could arguably pay attention

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to the spatial blend as well.

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As we can see, it goes from two D to three D.

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So what is that doing?

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Well, when we set it to two D, the audio listener isn't really going to care where the sound is originating

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from, but in three D it will affect how loudly we can hear that sound based on where we're viewing

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it from, from the camera.

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So if you think about three D games, if something's off in the distance, it's not going to be as loud

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as something that's right next to you.

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So not massive.

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Be relevant for our game.

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The only thing we really need to be aware of is that it should be set to two D.

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Now if we go ahead and hit play, we should find that audio source with Play on Awake.

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We'll start to play our music straight away.

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So let's hit play.

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And we do in fact get our music playing right out of the gate.

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And this has really drastically changed the feel of our game.

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For me, I think it makes the game feel a lot more exciting and as though we're going into battle against

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these invaders.

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So music selection is also incredibly important.

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So if we went with something more subdued, it would feel significantly different.

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So Music Choice is also a key part of your game design.

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So congratulations on adding music to your game.

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And with all of our sounds added, it's now time to start thinking about the user interface because

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our player can take damage, but we really have no idea of how much health we've got left or how many

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points we've been scoring.

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We'll start our journey into that in the next lecture, so I'll see you there.