Yomo Toro was the stage name of a Puerto Rican musician. He was one of the first to include the four in the sauce. His full name was Victor Guillermo Toro Vega.
Victor Guillermo Toro Vega, better known as Yomo Toro, was a well-known musician who was part of the orchestra Fania All Stars, and who was constantly called to perform the four in almost every music group "salsa".