凱莉·克萊森表示，《Heartbeat Song》對她來說就像一首讚歌，感覺像是一種提醒她自己所做的事。凱莉·克萊森稱在她懷孕前和懷孕期間將這首歌擱置，但是她的家人總是要聽這首歌，後來凱莉·克萊森選用《Heartbeat Song》成為《Piece By Piece》的首發單曲。
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中文歌詞
This is my heartbeat song and I'm gonna play itBeen so long I forgot how to turn itUp up up up, all night longUp up all night longYou, where the hell did you come fromYou're a different, different kind of funAnd i'm so used to feeling numbNow, I got pins and needles on my tongueAnticipating what's to comeLike a finger on a loaded gunI can feel it risingTemperature inside meHaven't felt it for a long timeThis is my heartbeat song and I'm gonna play itBeen so long I forgot how to turn itUp up up up, all night longUp up all night longThis is my heartbeat song and i'm gonna play itTurned it on but I know you can take itUp up up up, all night longUp up all night longI, I wasn't even gonna go outBut I never would have had a doubtIf i'd have known where i'd be nowYour hands on my hipsAnd my kiss on your lipsOh I could do this for a long timeThis is my heartbeat song and I'm gonna play itBeen so long I forgot how to turn itUp up up up, all night longUp up all night longThis is my heartbeat song and i'm gonna play itTurned it on but I know you can take itUp up up up, all night longUp up all night longUntil tonight I only dreamed about youI can't believe I ever breathed without youBaby you make me feel alive and brand newBring it one more time (one more time)This is my heartbeat song and I'm gonna play itBeen so long I forgot how to turn itUp up up up, all night longUp up all night long (Yeah)This is my heartbeat song and i'm gonna play itTurned it on but I know you can take itUp up up up, all night longUp up all night longThis is my heartbeat song and i'm gonna play itBeen so long I forgot how to turn itUp up up up, all night longUp up all night longThis is my heartbeat song and i'm gonna play itTurned it on but I know you can take itUp up up up, all night longUp up all night long
