Listen to When a Felon's Not Engaged online. When a Felon's Not Engaged is an English language song and is sung by Leo Sheffield, D'Oyly Carte Opera Company and Malcolm Sargent. When a Felon's Not Engaged, from the album Gilbert & Sullivan Ballads, was released in the year 2017. The duration of the song is 2:18. Download English songs online from JioSaavn.