1st concert, Styx and Rick Derringer, Boston Garden 1978 !!
Rick Derringer R.I.P
Unfortunately, another major 70’s guitar player checked in for "The Great Gig in the Sky."
Rick Derringer was one of those unique "did everything with everyone " musicians.
https://www.yahoo.com/entertainment/articles/rick-derringer-singer-hang-sloopy-175556224.html