Mandatory 8 tracks for cruising in the car while doing various questionable things.....That 70's show is the perfect generation for me!.
Lots of southern rock--Outlaws (Green grass and high tides!), Henry Gross (rare one), CHarlie Daniels band, Marshall Tucker (already mentioned)
Lots of hard rock--ZZ Top (La Grange), Aerosmith (Toys in the Attic)
More progressive things--Head East; I STILL listen to this!, Queen, or course, as mentioned above; WIshbone Ash Argus, Nils Lofgren Cry Tough,
My own personal favorite--Be-Bop Deluxe
By the way, in 1974? (not sure of the year) we saw Queen, Aerosmith, and Mott the Hoople. Some buddies of mine got backstage somehow and wondered into Queen's dressing room. I don't know where I was, and probably didn't know where I was at the time either!