Are Andy Cairns and Peter Murphy both singers?
yes
Title: Cuts You Up
Passage: "Cuts You Up" is a song by English musician Peter Murphy, from his third solo studio album, "Deep" (1989).  It was released as a single in 1990 through Beggars Banquet Records.  The song became Murphy's most successful release, topping at Billboard Modern Rock Tracks chart, as well as charting on Billboard Hot 100 and "Billboard" Mainstream Rock Tracks charts.
Title: Andy Cairns
Passage: Andrew James Cairns (born 22 September 1965, in Ballyclare, Northern Ireland), is a founding member, singer, guitarist, and songwriter for Therapy? , a punk rock/alternative metal band from Northern Ireland.
Title: Peter Murphy (musician)
Passage: Peter John Joseph Murphy (born 11 July 1957) is an English singer and musician.  He was the vocalist of the Goth rock group Bauhaus and later went on to release a number of solo albums, such as "Deep", "Holy Smoke", and "Love Hysteria".  Thin with prominent cheekbones, a baritone voice, and a penchant for gloomy poetics, he is often called the "Godfather of Goth".
Peter Murphy (musician) Andy Cairns