Using last week's tutorial, I managed to figure out how to create an audio visualiser in after effects -using an Audio Spectrum effect to react to the audio track. I have not recorded the original track yet, but I'll see if I can get on it tomorow. For now, I just used some random song in my music library to play around with the effect. I wanted to make a Guitar Hero spoof, so I made a crawling neck that changes colour using a 4-Colour Gradient Effect. I have created the buttons for the notes in Illustrator, but I have not imported those yet.
As you can see, still a work in progress - but I'm becoming very pleased with what I have so far. I was considering adding a custom shape particle effects with musical notes, but only if I have the time.