When something is so detailed and so complicated that dozens of things need to be in perfect sync for it to work properly, it's called a Goat Rodeo. That's the name master cellist Yo-Yo Ma chose to give his muscially-complex collaboration with bluegrass fiddler Stuart Duncan, bassist Edgar Meyer and mandolin master Chris Thile. The one-hour concert, filmed at the House of Blues in Boston, also includes an appearance by vocalist Aoife O'Donovan.