One Man Band

When you listen to music, you can hear all of the individual parts that make up the song, but when a computer plays the song, all of the parts are mixed together in one resultant sound.

You could observe this effect in any loud area, where there is more than one source of audio-wave creation.  Naturally people try to single out a certain source of noise, such as a person talking next to them.  If you try to zone out though, you can hear all of the noises as one conglomerate of sound.

My idea is that instead of singing or playing a single part in a song, you could sing/play all of them at the same time by only singing/playing the resultant sound.  Much in the way a beatboxer can create the illusion of many percussion instruments, you could take the part of the main vocalist, side vocalist, drummer, electric guitarist, pianist, and bassist all at the same time.