Oliver Gallego Sarmiento, known professionally as Mucho Muchacho, was born in 1976 in El Prat de Llobregat, Spain. He began his music career as a rapper and was initially part of the group Eat Meat, with whom he won the Rockdelux demo contest. After leaving Eat Meat, Gallego co-founded the group 7 Notas 7 Colores alongside producer Dive Dibosso and DJ Neas. In 2003, he established his own record label, C.R.E.A.M., under which he released his debut solo album Chulería. Mucho Muchacho also contributed to various collaborative projects, including Cookin Bananas with Cookin' Soul in 2013 and notable tracks such as "MUCHO BEEF" with Yung Beef in 2024. His discography includes significant releases like the maxi-singles Amor y Plata (2002) and Será Mejor (2002), featuring Tony Touch.