Rock Band Unplugged On the PSPgo and it's really cool (and free) Lite version idea

For a limited time, when you purchase a PSPgo system, you'll have access to a PlayStation Network downloadable voucher for Rock Band Unplugged Lite. This lite version of Rock Band Unplugged will allow you to play five full tracks. Plus, you can create your own personalized version of the game by purchasing your favorite Rock Band songs from the PlayStation Network. Now the only instrument you'll need to rock anywhere is the PSPgo system!