There's alot of different ways to look at this. Music is what each & everyone of us perceives it to be. As such, my perception is going to be different than everyone else. I mean, how many of us have had a grandparent whine about "What you kids call music,, isn't music". However, I do think there are some necessary elements that will qualify a sound as music. There must be some sort of rhythmic pattern to it, as such, Cage's definition does hit the nail on the head.