who will be the winner of the age of the cloud? do you even know what cloud is? let me give you the low down. there is not really a cloud in the sky that has all your files. there are storage facilities around the world that store your files and they allow you to access the files through the internet. anyways going to the music topic. right now it seams like everyone is trying to push some sort of music storage locker. each company has different wars of approaching this. Google is storing all your music on the cloud and allowing you to listen it on 7 devices. out of all of them this one is my favorite because of the massive 20000 song limit.
Next is amazon they are streaming songs that you purchase from amazon and you can purchase a data package to upload your songs. in my opinion i do not think people want to purchase songs by album or single still.
Apple is doing no streaming and not allowing songs to be acsesed through the web. they are taking your music and distributing it to the devices through a internet connection. you still need physical memory for this so this approach is different but may be more reliable.
Last is groove shark they are doing something amazing they are letting you stream all the music you can and your own and even download playlists for your iPod for a 10$ monthly charge. its your decision though pick a service that fits you best