In the early 1970s, many rock bands played psychedelic rock, a type of rock music which had words that described the use of legal drugs. Psychedelic rock described the experiences of taking illegal drugs such as marijuana and LSD and often encouraged people to take illegal drugs. Psychedelic rock bands included Big Brother & the Holding Company, Jefferson Airplane, The Grateful Dead, Jimi Hendrix, The Byrds, Pink Floyd, and The Doors.