Joe Loco, born José Estevez Jr., was an influential Puerto Rican pianist and bandleader in the mid-20th century, known for his unique blend of Latin jazz and mambo. He pioneered a style that incorporated classical music elements into Latin music, breaking traditional boundaries and paving the way for future innovation. Loco’s experimental approach to composition and his signature piano improvisations significantly impacted the evolution of Latin music, with his work as the leader of the Joe Loco Quintet, especially the album "Loco Motion", being particularly noteworthy. His influential career spanned over three decades, from the 1940s through the 1970s.