Dietrich employed Burt Bacharach as her musical arranger starting in the mid-1950s; together, they refined her nightclub act into a more ambitious theatrical one-woman show with an expanded repertoire. Her repertoire included songs from her films as well as popular songs of the day. Bacharach's arrangements helped to disguise Dietrich's limited vocal range—she was a contralto—and allowed her to perform her songs to maximum dramatic effect; together, they recorded four albums and several singles between 1957 and 1964. In a TV interview in 1971, she credited Bacharach with giving her the "inspiration" to perform during those years.