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Coamo, Puerto Rico

Among his best known compositions and arrangements are "De Barrio Obrero a la Quince", "El Timbal de Carlitos", "Mi Amigo el Payaso" (My friend the Clown) with lyrics by Luis Antonio Ruiz, "El Revendon", "Lluvia" (Rain), "Cuando No Hay Cariño" (When there's no Love). Plus, he also composed the following jazz tunes "Flip, flop", "Stop and go" and "My Favorite Thing".

Rosario also produced the following songs with the participation of Gilberto Santa Rosa, Tony Vega, Papo Lucca and Bobby Valentín; "Latin Jazz Go-Go-Go", "El Bravo soy Yo" (I'm the tough guy), "Too Too Much" and "Willie Rosario y su Ritmo".

Among the awards and recognitions bestowed upon Rosario are a nomination in 1987 for a Grammy Award for his song "Nueva Cosecha" (New Harvest), various Gold and Platinum Records, the Golden Agueybana Award, ACE, Diplo and Paoli Awards. In 2000, the Puerto Rican Senate paid tribute to Willie Rosario in recognition of his 40 years in the field of music. In 2002, Willie Rosario was inducted into The International Latin Music Hall of Fame.

Wllie Rosario's last production was "La Banda Que Deleita". He continues to play small venues in the San Juan area, having last been seen performing at Shots Bar & Grill in the Isla Verde Mall in late October 2006. Since his October 2006 performance, Willie Rosario and his band also performed for the Puerto Rican Medical Doctors' Association of El Paso (Texas) Gala in December 2007.