That Which Once Was Mine stands as a reflective song in the Strawbs' extensive catalogue, appearing on the 1990 compilation Preserved Uncanned. The track captures the band's signature blend of progressive rock and folk sensibilities, showcasing their enduring ability to craft emotionally resonant narratives through intricate instrumentation. Recorded during a period of continued evolution for the group, the song highlights their capacity to revisit and refine their musical identity while maintaining the melodic depth that defined their earlier work. As part of a collection that gathers significant recordings, it offers listeners a glimpse into the band's broader artistic journey, emphasizing themes of memory and change without relying on overt theatricality. The recording remains a testament to the Strawbs' commitment to quality songwriting and their lasting influence within the English rock tradition.