Slowing down the tempo for the Monday episode of The Kelly Clarkson Show, the 40-year-old host performed a charming cover of Nat King Cole's 1951 jazz classic "Unforgettable" in honor of Martin ...

John-Mark McGaha sings the music of Nat King Cole in "Unforgettable," a friendly, upbeat concert-style production at the Rep's Stackner Cabaret. It continues through Nov. 6.

John-Mark McGaha sings the music of Nat King Cole in 'Unforgettable," Milwaukee Repertory Theater's upbeat new show at the Stackner Cabaret.