The Kronos Quartet...that delightfully avante-garde and weird ensemble that has brought us wonderful music by Alfred Schnittke, Philip Glass, Osvaldo Golijov, Steve Reich, Tan Dun, Arvo Part, Henryck Gorecki, John Adams, Kayhan Kalhor, Terry Riley and tons of others. I just got their "Nuevo" album doing new music of latin composers. It is really good. I've also been wearing out their recording of Tan Dun's "Ghost Opera" with Wu Man on pipa.