One Last Song by Sam Smith is a heartfelt farewell to a past lover. The song explores themes of closure, longing, and emotional release. Sam Smith uses the song as a final goodbye, reflecting on the pain and memories left behind from a failed relationship. The emotional gravity of the track is captured in poignant moments such as the chorus, where the artist sings about regretting the end of the relationship but ultimately finding the strength to move on. The tender vocals, paired with soulful instrumentals, highlight the internal struggle and eventual acceptance of the end.