(MSNBC) — AP reports: At a concert tonight at the White House marking Black History Month and celebrating the blues, President Obama again took the mic.

He was challenged by the musicians on stage to follow up his Al Green “I’m So In Love With You” performance, “You done started something, and you gotta keep it up now.” After initially laughing off the offer, the President took the microphone and sang several lines of “Sweet Home Chicago” from his spot in the front row. He tried handing the mic back more than once, but continued singing, even alternating lines with BB King.

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