Arriving in New York City from Puerto Rico in 1948, Rosario was moved by Tito Puente's drumming ability at the Palladium Ballroom. He began his percussion studies and made his pro debut with Johnny Sequi's band in 1953. When Sequi moved to Puerto Rico, Rosario took over the band and today it is among the most popular salsa and Latin jazz aggregations in Latin America. ~ Max Salazar