The meat of the Rock Band strategy lies in its multitude of downloadable songs. That's what separates the franchise from the doomed Guitar Hero series, which failed due to its release of retail disc after retail disc. It's fitting, then, that Rock Band 3, the latest title in the series, is now available as an entirely digital experience. That's right: Rock Band 3 is now available through the Xbox 360's Games on Demand.

If you've got the space on your hard drive for the download and $19.99 to spare, every one of the 83 songs the game offers is yours. No need to mess with a game disc and box. Now if you'll excuse me, I'm gonna rock a little "Power of Love" by Huey Lewis and the News.