Let me go into a bit more detail: I have a large music collection and I am against the idea of a cloud.
First of all, streaming media from online right now is not perfect. No matter how good your network is, there will always be hiccups (likely caused by buffering). Even if it's only for five seconds, it still means a disruption in the flow of my music.
Second, what if I'm in a building or going through a tunnel where I can't get service on my phone? That isn't all that uncommon. Guess that means I can't listen to music then, either.
And lastly, why would I want to pay for a subscription to access music? (I'm assuming that's how they'll do it.) Right now when I walk down the street listening to music or if I'm on my laptop, I do so for free. The last thing I need or want is another bill for something that previously wouldn't cost me anything.