I take it back. I did DVR it just in case, and I skipped through to Radiohead's performance. It was pretty original and high-energy and otherwise brilliant. Typical for those guys. Also caught Carrie Underwood, and while I don't dig her music at all, I always admire her in performance. Pretty kickass.
And I agree, the sound was atrocious. Way too much room sound... everything was washed out and indistinct without impact. This wouldn't be the first time that there were major gripes in the industry regarding the sound for this show. Shouldn't it be pretty much the best-sounding show on the planet for crying out loud?
Wow, cool if it did. I had heard of Plant before of course (Led Zep) but that album was my Intro to Alison Krauss. She's a country / blues / bluegrass singer with a really great voice. Here's a good sample of her duets stuff with Plant: