What is a torch singer?

A torch song is plainly defined as a sentimental song of unrequited love; The name comes from the phrase “to carry a torch for” (to be in love). It’s most associated with the Great American Songbook: the canon of influential American popular songs, show tunes and jazz standards released from the 1920s to the 1960s. Torch songs are defined by the lyrical themes of love, loss and longing rather than an allegiance to a particular genre. This musical categorization, though—as is the case with most—can only really be understood by example.