With sparkly hula-hoops circling their waists, Brett Yang and Eddy Chen started their energetic rendition of the Bach Double Violin Concerto’s first movement. The piece is normally stoic and controlled, but as the pair soldiered on, audience members laughed and cheered on Tuesday night at Symphony Center.

After the four-minute piece’s final D chord rang out, Yang and Chen let the hoops clatter to the stage floor. The comedy classical music duo, known as TwoSet Violin and popular on YouTube, stopped to catch their breath as their fans clapped and whooped.

“A live concert is the next level up,” Chen, 32, said Tuesday morning, drawing a comparison to making online videos. “It’s not just about us. It’s also the fact that TwoSet is surrounded by other passionate musicians — people that are al

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