How to improve your technique on acoustic guitar, fretless guitar, and bouzouki. Dimitri Lappas has over 4.500 collaborations on television, radio and live concerts all over the world as a composer, musician, producer and arranger. He has collaborated with singers as George Dalaras, Eleni Vitali, Haris Alexiou, Eleftheria Arvanitaki, Dionysis Savvopoulos, Orfea Peridi, Pantelis Thalassinos, Vasilis Lekkas and many others.