 In the last couple of years Milen has worked with many of the most famous Bulgarian musicians – Teodosi Spasov, Mitko Rupchev and Stefan Valdobrev – and he has been a member of Kaffe since 2002.He still studies at the Music Conservatory in Sofia.Valery Tzenkov, born on 3 September 1973, started to play different instruments when he was a child.