Blushing to say I don't remember which was my first concert.
Started going to them in 1977 when my younger brother got a gig working as an usher for the company that provided such services for most major concerts in DFW, TX
The smell of pot was SO STRONG coming from the doobies in my hands.
In that first year saw Styx, KISS, Led Zep, Aerosmith
Oh and I got some of my first nookie the night I took my semi-Christian (heh) girlfriend to see Bread