Par VASKS PETERIS. The Latvian composer Peteris Vasks, who is known for his atmospheric pieces for string orchestra, “Cantabile”, “Musica dolorosa” and “Voices”, is concentrating increasingly on chamber music: his latest works are the “Partita” for cello and piano, the “Fifth String Quartet” and a piano quartet. Vasks has brought elements of ancient and folk traditions in Latvian music into his co…