Marc Bolan started T. Rex in the late 1960s as a folk band called Tyrannosaurus Rex and found some success. He then invented glam rock, shortened the band name to T. Rex and recorded a string of hits. Bolan died in 1977, but in his short time he made a huge impact.
Jefferson Airplane soared high (see what I did there?) in the late 60s as pioneers of psychedelic rock. They had hits with “White Rabbit” and “Somebody to Love” and played at huge festivals like Monterey Pop, Woodstock, and Altamont before suffering a commercial decline. Members then spun off into Jefferson Starship, Starship and Hot Tuna.