If you want the benefits of iTunes in the Cloud for music you haven’t purchased from iTunes, iTunes Match is the perfect solution. It’s built right into the iTunes app on your Mac or PC and the Music app on your iOS devices. And it lets you store your entire collection, including music you’ve imported from CDs or purchased somewhere other than iTunes. For just $24.99 a year.
Personally I get my music onto my Android phone with a MOG subscription, and I sync a number of other things with Dropbox.