Associated Press photos

Chris Thile and Yo-Yo Ma, above, and Stuart Duncan, Edgar Meye, and guest Aoife O’Donovan will perform at Tanglewood in Lenox at 8:30 tonight as Goat Rodeo -- an organic cross-genre project stemming from their friendship: ‘A chaotic situation, often one that involves several people, each with a different agenda/vision/perception of what’s going on.’