How Desperate Is PBS?

I was channel surfing tonight and when I hit PBS Las Vegas, Channel 10, and they had Pink Floyd singing "Another Brick In The Wall", the song most teachers don't like.
But under further review, the band was not Pink Floyd but a cover band.  This is the first time I have seen a tribute band on prime time on PBS.
That's not to say that tribute bands are bad, one of my favorite concerts I've been to was a cover band for Queen that we saw at the Las Vegas Hilton.  http://lasvegasbadger.blogspot.com/2010/07/queen-nation-review-fantastic.html
It seems now that PBS is going generic by going with tribute bands instead of the real thing.