Marcus "Marbles" Le Marquez

Jazz musician who asked drummer Bart Simpson to join him and Defonzo "Skinny" Palmer. He played the bass.

He and Defonzo ask Lisa Simpson to sit in another chair in the audience as they wanted to jam with Bart. They nickname Bart "Tick-Tock" and make him part of their band. After Bart hurts his right arm, they hold a benefit concert to raise the money for Bart to have surgery to fix his arm again so he can drum.