I got bored 25 seconds into playing. Seriously, I watched for about 10 and was like hmm this could be okay actually. Then I played it, proved no incentive to learn how to play the flutes and various instruments, so I didn't.
I also tried the drums, seemed cool, but would probably take almost as much work to learn how to play them as with real drums and still feel 1/4 of the awesome real drums would provide. Trust me, it was the most underwhelming game of the Wii universe. That and Sluggers.