Césario Concepción Martínez, (28 July 1909 – 11 March 1974), was a Puerto Rican musician, big band leader and composer, who brought the music of his native land to the United States, mainly New York City, and Latin American ballroom dancing between the 1940s and early 1970s and to ballrooms all over the world.
He wrote over 100 mambos, calypsos, boleros and plenas songs to honor cities such as San Juan, Mayagüez, Ponce, Yauco, Plena Criolla (for Caguas), San German, Pa Mi Pueblo, Cayey his town and Santurce among many others.
In 1933 together with his family boarded a ship, SS San Juan and migrated to New York City.
Upon his return to Puerto Rico founded, on June 14, 1947, "César Concepción y su Orquesta" and made its first presentation at the New Yorker Hotel, later known as Flamboyan Hotel, via live broadcast from WIAC radio station.
He died in Río Piedras, Puerto Rico of a heart attack at the age of 64.