Recorded during Marianne Faithfull's early 1960s period, "Once I Had A Sweetheart" appears on the compilation Decca Years 1965-1967. The track exemplifies the intimate, confessional style that defined her debut era, blending folk and pop sensibilities with a raw emotional honesty. Faithfull's vocal delivery captures the vulnerability of a young singer navigating the complexities of romance and self-discovery, a theme central to her early discography. Released alongside other seminal tracks from this time, the recording contributes to her legacy as a pioneering figure in British singer-songwriter culture, influencing generations of artists who prioritized personal narrative in their music.