Summary: As others have already stated, this track pack could use more songs. Having said that, I will say that the song selection is pretty good though. I love the fact that they put "Closer to the Heart" by Rush on this - one of my favorite Rush songs. Two thumbs up. To clarify, just in case there is still some confusion out there about compatibility, this track pack (for the Wii) IS compatible with the Wii Band Hero instruments.
Summary: A good alternative to having Downloadable Content (DLC) on the Wii. This track pack gives you the opportunity to own 20 of the songs that the other consoles can purchase individually. This game does NOT require you to own any other version of Rock Band, it is a stand-alone. So in that aspect it could be viewed as a large demo. The song listing in my opinion is just OK, but that is all about your own personal taste. The songs are all master recordings.