Here's a bluegrass group I like a lot, at a festival in France last August. This is a working band that's 'on the bubble'... the musicianship is super-tight, the show not quite yet polished, but you can tell they're going somewhere, and they want it.
Followed the trail from Coz' link to Deadgrass. They've got a cool/fun thing together. //www.youtube.com/watch?v=5VkgNt-RKWc
... Here's Brittany Haas (one of his many protege') with Darol and his current band, Mr. Sun. //www.youtube.com/watch?v=rxMwu306Cbc
Oboe, Alto Saxophone, and Euphonium Trio in G Minor, Op. 21 by Ian Deterling: //www.youtube.com/watch?v=-kNBgrjwWQsPeter