If you have uploaded songs from computer to Amazon Cloud Player or had music collection on Amazon MP3 site, it is easy to download songs to your android tablet like Nexus 7, Samsung Tab or phone like Samsung Galaxy S3 over WiFi.
How to download Amazon mp3 songs to android device
* First you need to download and install the free android app called Amazon MP3 from Google Play store on your device.
* Launch the app, tap Cloud > Playlists. There is a download button next to your songs. Tap on it to start. Then you could find them under Device tab.
* When I try to streaming music and the N7 screen is locked, the app fails to buffer properly and I have to unlock to make it to work.