sentences:  The couple specializes in older popular songs, primarily from the first half of the 20th century, but extending beyond that to include both contemporary cabaret songs and a number of songs dating back to the American Civil War.Their recordings for Nonesuch, RCA, Columbia and Arabesque include songs by the great songwriters of the 1920s and 30s such as Kern, Gershwin, Porter, and Rodgers and Hart.They also have performed and recorded songs by the rock-and-roll team of Jerry Leiber and Mike Stoller.