Happiest Year is a song by American singer-songwriter Jaymes Young, built around a quiet piano ballad about looking back on a relationship that has ended. The chorus line thank you for the happiest year of my life became widely shared online as a sound for emotional edits, especially year-end recaps, graduation videos and farewell montages on TikTok and Instagram Reels. Creators reuse it because the lyric works as a sincere thank-you and a goodbye at once, giving a simple montage an emotional ending without needing extra explanation.