I remember that South Park episode, that was a good one! The boys joined the Peruvian pan flute craze and started a pan flute band of their own.
I heard a pan flute band live once, they were performing in a public square. I thought the music was pleasant enough, and a friend of mine even bought a CD. My only criticism is that a lot of it seems to sound the same, but I think that's true with many genres.