The cellist Constantine Boudounis and violinist Lydia Mpoyntoyni, or else ' Demons ' String, They began collaborating in 2010, After a course of studies, Awards in competitions, recordings, participations in cd and concerts in Greece and abroad. In recent years written songs. Have been involved with all styles of music, after their program, Apart from their own projects (Pontiac Casino, Pirate, Life and Vagrancy, etc.), includes covers ranging from the Bach, the Vivaldi, the Hadjidakis and arrive in Iron Maiden, the Queen, the tsitsanis and Markos Vamvakaris always giving these two traditional rock instruments, Classic, other folk and pop 'form' that they deserve and uniting firmly the Greek musical tradition with the wider Western music.