Anything (everything) by Deep Purple, Allman Brothers, Janis Joplin, Grand Funk.
That is my favorite era too.
There were lots of very good one hit wonders, too - Blackfoot, Bloodrock, MC5 - more than I can remember. Like someone else said, the list is almost endless. It was a high energy time.
SCORPIONS ! LOVEDRIVE , album cover got my attention . Great L.P. as well . Other album covers that swayed me to purchase as a teen were RUSH " 2112 " , THIN LIZZY " Jailbreak " , HEAD " Get Yourself Up " , DOOBIE BROTHERS " What Were Once Vices Are Now Habits " and many others .