I Wonder Where My Baby Is Tonight is a 1925 popular song written by Walter Donaldson (music) and Gus Kahn (lyrics). It was first recorded by Billy Jones on October 13, 1925 and published that year as sheet music in New York by Irving Berlin, Inc. The tune captures the Jazz Age mood with a wistful refrain that asks I wonder where my baby is tonight, and it has since been covered by many artists in a wide range of versions and medleys. The original sheet music lists the key as F major with a moderate tempo, and the song is widely regarded as a standard from Walter Donaldson’s early catalog. There is no single album associated with the song at release, but it has appeared on numerous recordings and remains a staple of early American popular music.