So, I just randomly stumbled across this page that basically shows that if you hear a phrase 4 or so times, repeated, then it will start to sound like music. The "musical illusion" is that from then on, when you hear the phrase, it will sound more like music than regular talking.

Quite interesting IMO:

http://thinkorthwim.com/2007/11/26/a-mus...o-singing/