The theme song for
Once Upon A Song is called "Doing a Good Show" (做場好戲), sung by William So, Charles Ying, Kate Yeung, Jason Chan, Lesley Chiang and Benji Chiang.
VIDEO
曲：楊鎮邦
Lyrics
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William So sings the sub-theme song, "Even If No Longer Friends" (即使不再是朋友). Bernice Liu is featured in the MV.
曲：雷頌德 | 詞：甄健強 | 唱：蘇永康
Lyrics
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Kate Yeung's song from the series, "Naturally Gifted' (得天獨厚)
曲：雷頌德 | 詞：甄健強 | 唱：楊淇
Lyrics
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The sub-theme song by Evelyn Choi, "Chasing Rainbows" (追蹤彩虹)
VIDEO
曲：雷頌德 | 詞：甄健強 | 唱：蔡穎恩
Lyrics
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The ending theme song by Kelvin Kwan, called "Not Mentioning A Word" (隻字不提)
VIDEO
曲：伍卓賢 | 詞：陳詠謙 | 編/監：馮翰銘
Lyrics
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Jason Chan's song in the series, "One Word, One Tear" (一字一淚)
VIDEO
曲：馮翰銘 | 詞：陳詠謙 | 唱：陳柏宇
Lyrics
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"Miracle" (奇蹟) by Kate Yeung
VIDEO
曲：雷頌德 | 詞：甄健強 | 唱：楊淇
Lyrics
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Evelyn Choi's song, "Losing What Was Gained" (得而復失)
VIDEO
曲：雷頌德 | 詞：甄健強 | 唱：蔡穎恩
Lyrics
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Charles Ying sings "Love is a Game" (愛即是遊戲)
VIDEO
曲: 雷頌德 | 詞: 甄健強 | 唱: 應昌佑
Lyrics
