President Obama, Mick Jagger, B.B. King sing the blues together

Shame on President Barack Obama for hiding his stellar singing voice all of these years. Think of the "Saturday Night Live" skits we could've experienced during his tenure as Commander in Chief!

Obama first stretched his vocal chords when he sang a line from Al Green's "Let's Stay Together" at a fundraiser in Harlem, and now he's done it again at the taping of a PBS special on Tuesday (Feb. 21), Reuters reports.

Obama sings a solo verse of "Home Sweet Chicago" alongside Mick Jagger and blues legends B.B. King, Jeff Beck and Buddy Guy in the finale of "In Performance at the White House: Red, White and Blues," which will air on PBS Feb. 27 in honor of Black History Month.

"We were trying to get you to help us sing. I heard you singing Al Green," Guy tells Obama before handing him the microphone. "So you started something. You got to keep it up now. You can do it."

There's no YouTube video, so we'll have to wait until the special airs next week to see how Obama does.