Presdient Barack Obama jamming out the blues number Sweet Home Chicago with BB King, Mick Jagger and Buddy Guy. See another video here – www.youtube.com (Reuters) – Bill Clinton had his saxophone, but President Barack Obama can sing the blues. Obama lent his voice to a White House jam featuring Mick Jagger, BB King, Jeff Beck and Buddy Guy on Tuesday during a celebration of blues and its influence on modern pop culture. After wowing crowds in January by singing a line from Al Greens classic hit "Lets Stay Together" at a Harlem fundraiser, the President sang a verse of "Sweet Home Chicago" in the all-star finale of a TV special taped at the White House. "We were trying to get you to help us sing. I heard you singing Al Green," blues guitar legend Guy hollered to Obama on Tuesday. "So you started something. You got to keep it up now. You can do it." Taking a microphone handed to him by Rolling Stones frontman Jagger, a smiling Obama sang a solo verse of "Sweet Home Chicago" before handing back to the band. The performance was part of a PBS television special marking Black History month that will be broadcast on February 27 as "In Performance at the White House: Red, White and Blues," the public broadcaster said. Obamas blues solo recalled Clintons saxophone playing appearance in 1992 on the "The Arsenio Hall Show", which was credited with boosting his presidential campaign. Obamas brief rendition of "Lets Stay Together" in January helped increase sales of the 1971 Al <b>…<b>