Mercedes Trujillo Callealta (born 14 June, 1974) is a pop artist from Cádiz, Spain. Merche got her first guitar at the age of six and became a music teacher after her graduation. At that time she also sang in an orchestra called Bahia Azul and also worked as direction assistant in Astilleros de Cádiz.
In 2001 Merche were in the Spanish pre-selection for Eurovision Song Contest with the song "No Pidas Mas Amor" under the name Luna. She finished in 6th place, but signed with Vale Music and start to record her first album Mi Sueño.