Listen to Sweet Little Mystery (BBC TV "Old Grey Whistle Test" / London / 1981) online. Sweet Little Mystery (BBC TV "Old Grey Whistle Test" / London / 1981) is an English language song and is sung by John Martyn. Sweet Little Mystery (BBC TV "Old Grey Whistle Test" / London / 1981), from the album The Island Years, was released in the year 2014. The duration of the song is 4:59. Download English songs online from JioSaavn.