Lupe's passionate performances covered the range of music: son montuno, bolero, boogaloo, venturing into other Caribbean styles like Dominican merengue, Puerto Rican bomba and plena. It was her recordings which brought Tite Curet Alonso into prominence as a composer of tough-minded boleros in the salsa style. For a good part of the 1960s she was the most acclaimed Latin singer in New York City due to her partnership with Tito Puente. She did a wide variety of cover versions in either Spanish or accented English, including "Yesterday",