Timothy Lee McKenzie, better known by his stage name Labrinth, is an English singer, rapper, songwriter, and record producer. Labrinth signed as a recording artist with Simon Cowell's record label Syco Music in 2010, initially collaborating with the English rapper Tinie Tempah. He appeared as a featured artist: uncredited on the single "Pass Out", but later officially on "Frisky"; then he released his first solo single, "Let the Sun Shine" in September. All three songs peaked in the top five on the UK Singles Chart.

Sia Kate Isobelle Furler is an Australian singer and songwriter. Born and raised in Adelaide, she started her career as a singer in the acid jazz band Crisp in the mid-1990s. When Crisp disbanded in 1997, she released her debut studio album, OnlySee, in Australia. Sia moved to London and provided vocals for the British duo Zero 7. She released her second studio album, Healing Is Difficult, in 2001 and her third, Colour the Small One, in 2004.