Morales has directed and performed internationally with numerous Latin Jazz ensembles with guest artists such as Tito Puente, Dave Valentín, Giovanni Hidalgo, David Sánchez, and Luis “Perico” Ortíz, Eddie Palmieri, Pappo Lucca. Mariano Morales has worked with leading pop artists such as: Andrea Bocelli, Marc Anthony, Franco D’ Vita, Ricardo Arjona, and Tego Calderón, among others. Mariano has also performed as guest pianist with the New Mexico Symphony Orchestra, the Houston Symphony Orchestra, the Puerto Rico Symphony Orchestra and the Arturo Somohano Philharmonic Orchestra. As a performer and arranger in the tropical music scene Morales’ work can be heard in recordings of artists such as Celia Cruz, El Gran Combo de Puerto Rico, Gilberto Santa Rosa, Tito Nieves, Olga Tañón, Oscar de León, Cheo Feliciano, and Víctor Manuelle, amongst others. His work can be found in Grammy winning productions such as Marc Anthony’s “Contra la Corriente”, and El Gran Combo's Arroz con Habichuelas”.