Ayalah Deborah Bentovim, better known by her stage name Sister Bliss, is a British keyboardist, record producer, DJ and songwriter. In the studio, she is best known for her work with Rollo Armstrong as one half of the production duo Rollo & Sister Bliss, and particularly as part of Faithless.

Rowland Constantine O'Malley Armstrong, known professionally as both Rollo and R Plus, is an English music producer. He is one half of the remix/production duo Rollo & Sister Bliss and is a founding, non-touring, member of the electronic music group Faithless. He has produced and remixed many tracks for Dido, Pet Shop Boys, Simply Red, R. Kelly, U2, Moby, Grace, Tricky and Suede. He is also known for producing UEFA Euro 2008 theme, which is also used as UEFA Super Cup, UEFA Women's Championship, and youth tournaments theme since 2017.