Vanilla Fudge is an American rock band formed in 1965, pioneering the psychedelic rock sound with their heavy, orchestral arrangements and reinterpretations of classic songs. Led by vocalist Mark Stein, the group became famous for their ambitious covers, most notably their extended psychedelic version of "You Keep Me Hangin' On," which showcased their innovative approach to rock music. Their influential debut album and subsequent releases helped define the psychedelic era of the late 1960s, cementing their legacy as trailblazers in progressive rock.