Scott Joplin

Scott Joplin is an African-American ragtime artist from the late 19th / early 20th century. He wrote many pieces for the piano, most famously "The Entertainer" and "Maple Leaf Rag". In-story, he has a home in Texarkana (the town in which he grew up) and spends a lot of time in an underground complex.

He first appears in Welcome to Pondgea, and he just so happens to be in the underground complex when the protagonists end up falling into it. He plays as a supporting character throughout the part.

He then appears in They Might Be Giants vs. The Particle Gadget in the New Belgium Museum playing ragtime in the background. When Sandy unleashes an evil Particle Man, Joplin sides with the protagonists and throws his piano at it in a comical manner.

He later appears in Empty Headed End, once everyone in-story is thrown in prison.

He appears in This Part Is About Love, complimenting Doratron, stating "Nice piano" (after said piano inevitably hit her in the face.)

He would later appear in I Hate Proms!, as the characters discover a passage of the underground complex that he just so happens to be walking by. They follow him down the passage into the complex as he explains how he is usually down there.