Amazon Cloud Drive is another hard drive in the cloud. You can store music, videos, photos, and documents on Amazon's secure servers. Just sign in with your Amazon account or create one, then just upload your files. Cloud Drive offers 5 GB of free storage, enough space to store lots of files.
Amazon Cloud Player allows you to play the music you have stored in your cloud drive. The cr48 can’t upload directly to cloud player so just upload your songs into your cloud drive first. I use cloud player to listen to music on my cr48, just until Google launches their cloud music service soon.