Metiendo Mano! (transl. "Hard at work!") is the debut studio album by Puerto Rican-American trombonist and singer Willie Colón and Panamanian singer-songwriter Rubén Blades, released on October 7, 1977, through Fania Records. The album was produced by Colón and Jerry Masucci and is the second of four collaborative duo albums by Colón and Blades. The record includes the song "Pablo Pueblo", which is considered to be one of the initial forays into "conscious" or "intellectual" salsa and was the theme song to Blades' unsuccessful Panamanian presidential bid in 1994. Craig Harris wrote in MusicHound World that the album "not only represents a historic meeting of musical minds but remains a dance-inspiring masterpiece."