Formula, Vol. 1 is the debut studio album by American singer Romeo Santos, released on November 8, 2011 by Sony Music Latin. It is Santos's first album as a solo artist following the break-up of American bachata group Aventura, of which he was the lead singer. The record contains fifteen tracks, most of which were composed by Santos and co-produced with Ivan Chevere. The album experiments with the sound of bachata and other genres including R&B and flamenco. It features several Anglophone and Hispanophone guest artists including Usher, Tomatito, Mario Domm, and Lil Wayne. Recording for the album took place in 2011 at The Castle, Fight Klub, and EMG Studios in New York City. A deluxe edition of the album containing five extra tracks was released exclusively in Walmart retail stores in the United States.