This much-anticipated collaboration of Salsa music stars Rubén Blades and Cheo Feliciano, where each singer performs songs from the other singer. There is a great cast of musicians: musical director and arranger Luis Garcia on the Tres guitar, Luis Marin in piano and vibes, Cachiro Thompson and Georgie Padilla on congas, Charlie Sierra on timbales, Pedro Perez on bass. The album title comes from a phrase Cheo Feliciano used at the beginning of his career, derived from "everybody say aha!"