Smackie, I like the idea! The trick will be convincing them that it will draw in the pledge money like the shows that the doctors (James Taylor) like to watch.
Maybe you can get some stats on how NPR is doing with their concerts they are broadcasting from DC. If the numbers look good, seems it should help support your claims as it's basically the same concept.
Personally, I've stopped bothering with any of the music broadcasted on PBS because it's always, James Taylor, The Moody Blues, or some other show that I just don't feel like bothering with. I did enjoy the Cream concert but that was a rare event. They really need to broadcast some bands with some youth and life in them. I'm not saying send the oldsters off to the soylent green factory. But I am saying they need some fresh blood and some variety. Some of the bigger US festivals would offer loads of variety and lots of fresher material along with a few classics.
I myself am in the doctors age brackett but can't stand most of what they watch, music-wise. To top it off, polls and surveys usually weed me out assuming that I don't buy CDs or fit what they are looking for. I don't want to say it's discrimanitory but I will say they are leaving out a viable part of the market based on faulty assumptions.