Monster is the 29th album by jazz pianist Herbie Hancock. As a follow-up to the album Feets, Don't Fail Me Now (1979), it continued the trend of disco songs, lacking any jazz influence. The album features vocals on each track, this time without vocoder processing. The album also includes an appearance by Carlos Santana on the opening track "Saturday Night";[1] this track was the first of many eventual collaborations with Santana, including the 1980 album The Swing of Delight. The track "Stars In Your Eyes" was issued as an extended 12" single.