Playing underground is nothing new for Chris Robinson.The former singer for the Black Crowes, who now fronts The Chris Robinson Brotherhood, got his start playing in the basement of his family home. His dad would holler down the stairs and tell him playing such loud music would never get him anywhere in life.“He was wrong about that one,” Robinson told the Standard while backstage at Bluegrass Underground on Friday night. “People have always told me you’re not a songwriter, you can’t be a musician, but 30 years later that’s all I’ve done.