Marcus Le Marquez

Marcus "Marbles" Le Marquez is a Jazz musician who asked Bart to join him and Defonzo "Skinny" Palmer. He played the bass.

History
He, and Defonzo, ask Lisa 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.

He was married to Skinny's sister until she died.

He was present during Trappuccino.