Hailed as "The Edith Piaf of Klezmer," Schwartz has been called "a revelation, with a superb mastery of Klezmer ornamentation." For centuries, Klezmer music was dominated by instrumentalists who strove to imitate the human voice, the sole purveyor of the liturgy on which Klezmer was based. Schwartz has reclaimed the vocal origins of this genre. Her timbre, phrasing, and intonation are impeccable.

Schwartz sings in Yiddish, Hebrew, Ladino, Romanian, Romani, and English.