Spanish bass player and founding member of the progressive rock band Obus, Juan Luis Serrano—known by the moniker "Tio Luis"—was instrumental in shaping the group's sound during their classic era. His bass work provided the foundational groove that defined Obus's most celebrated recordings, contributing to the band's influential presence in the Spanish rock scene.
Serrano's tenure with Obus during their formative years established him as a key collaborator in the band's most creatively vital period, though he departed before the group's 1990s revival.