"A world without music is like Communist China."

That quote is from Steve Murphy, for the record. You'll see it in Jesse's video journal.
I think that a world without music isn't a world at all. There'd just be no sound in general.
This is music's definition:
music [myoo-zik] - noun. any sweet, pleasing, or harmonious sound or sounds.
By definition, music can be ANY SOUND. If it's pleasing to someone, if it's sweet to someone, if someone likes it, then it's music.
Theory:
Art is everywhere. Music is art. Therefore, music is everywhere.
A world without music basically can't exist. Any sound or combination of sounds can produce music.