Google Music is currently running a blowout sale offering up “millions” of songs for $0.49 per track or $4.99 per album and no these aren't your mommas favorites. They are offering a ton of newer stuff as well as some good old favorites. Just from the main list I see some of today's top tracks from Eminem, Lady GaGa, Toby Keith, Coldplay, J-Lo and NIN. There are also some oldies but goodies like Frank Sinatra, Stevie Wonder and the Rolling Stones.
The music is all DRM-free and can be used on any device including Apple devices (iPod, iPad, etc). To download the music, you can either do a browser download (limited to 2 times) or use Google Music Manager. The nice thing is that it appears the music will always be available in your Google Music Library and you can stream it anytime and/or download it to your device.
Google says this is a limited time offer but there is no word on when it will end. For more details checkout the Google Music section of the Android Market.