Crest of a Knave is the sixteenth studio album by British rock band Jethro Tull, released in 1987. The album was recorded after a hiatus of three years occasioned by a throat infection of vocalist Ian Anderson. After the unsuccessful Under Wraps, the band returned to a more heavy blended electric with acoustic style of sound, one of the top characteristics of Jethro Tull. The album was their most successful since the 70's, and the band enjoyed a resurgence on radio broadcasts, appearances in MTV specials, and recording music videos. The album was supported by the "The Not Quite the World, More the Here and There Tour". The album relied more heavily on Martin Barre's electric guitar than the band had since the 1970s. The style of Crest has been compared to that of Dire Straits, in part because Anderson no longer had the vocal range he once possessed (the result of recent throat surgery). This reissue features the bonus track "Part of the Machine."