this amazing song is distributed for free on an archived old version of the artist's website, keaton-world! there's a lot of great music and internet content in general on this site worth checking out!
i always found the contrast of the name of the song, Lingering Resentment, with its hopeful and upbeat melody to be interesting and unexpected, though a perfect fit for a character like Silver who struggles with resentment and regret. the feeling of this song is, to me, one of fighting to not let these feelings consume you and your love for other people, and learning to continue your life with warmth towards people while you try to deal with your pain.