During the 1960s, this second group of casual lysergic acid diethylamide (LSD) users evolved and expanded into a subculture that extolled the mystical and religious symbolism often engendered by the drug's powerful effects, and advocated its use as a method of raising consciousness. The personalities associated with the subculture, gurus such as Timothy Leary and psychedelic rock musicians such as the Grateful Dead, Pink Floyd, Jimi Hendrix, The Byrds, The 13th Floor Elevators, Ultimate Spinach, Janis Joplin, Crosby, Stills & Nash, The Doors, Blue Cheer, The Chambers Brothers, Country Joe and the Fish, Big Brother and the Holding Company, Jefferson Airplane and the Beatles, soon attracted a great deal of publicity, generating further interest in LSD.