"Is That All There Is?" was recorded in January 1969 and originally released as a single on Capitol Records the following September. It reached #11 on the Billboard Pop charts and #1 on the Adult Contemporary charts, and Peggy Lee won a Grammy Award for her performance in March, 1970.

This unexpected success provided the impetus for an entire album of similar material. However, instead of recording a fully realized follow-up album, Capitol's November 1969 Is That All There Is? LP was hastily assembled from one new October recording date and a variety of sessions going back to June 1967, while Miss Lee toured on the strength of the hit.

Six years would lapse before Mirrors was recorded, by which time Miss Lee had changed record labels. "Is That All There Is?" was not part of the original Mirrors LP; it was first added as a bonus track for the 1989 A&M CD reissue.

All the tracks from Mirrors, including two previously unreleased outtakes, were remixed and included in the limited edition CD, Peggy Lee Sings Leiber & Stoller (Hip-O Select, 2005.)

"Is That All There Is?" was arranged and conducted by Randy Newman. "Ready to Begin Again (Manya's Song)" was arranged and conducted by Perry Botkin, Jr.