Artemios "Demis" Ventouris-Roussos (15 June 1946 – 25 January 2015) was a Greek singer, songwriter and musician. As a band member he is best remembered for his work in the progressive rock music act Aphrodite's Child, but as a vocal soloist, his repertoire included hit songs like "Goodbye, My Love, Goodbye", "From Souvenirs to Souvenirs" and "Forever and Ever".