Thank you thank you!  I was also at the Pittsburgh show (at the Civic Arena) and could not remember who the main act was because Rory was so damn good.  I had never heard of him, and he came out in that flannel shirt (unheard of for a rock act in the '70's) and just blew us away.  Thanks for finally answering that question.  And yes, Iremember booing Foghat (hated them ever since) and chanting for Rory.