Hmm, so. What I've got here is a couple of tracks I put together with Garage Band as a project for Music class in school . . . about six years ago.
Garage Band by Misheard Whisper on SoundCloud - Create, record and share your sounds for free
The first track was following the simple brief of creating a piece of music with an overarching 'theme'. As you can see, I chose sci-fi. The second one (actually the first one I did) was simply a practice in stacking multiple tracks on top of each other, and it came with the stipulation that we had to include a sudden change in genre/pace/whatever halfway through the track.
There'll be more if I can figure out how to do Garage Band without Garage Band. o3o