Yep, I like Tull also. I heard they had something to do with Jimi Hendrix getting famous, but it was too long ago... and I was probably Thick As a Brick.
When recording the guitar lead for Aqualung, Martin Barre looked up and saw Jimmy Page waving from the studio window. He had the choice to wave back, or to continue on without missing a beat. He chose to ignore Jimmy and improvised the version we've heard all these years. I'm sure they both laughed about it later over a couple pints (and lines), but I'm glad he chose wisely. :-)