I don’t know how to sing a tune,
Meaning: I’m not skilled at singing songs.

Or dance beneath the stars or moon.
Meaning: I can’t dance beautifully either.

But what I feel is pure and true,
Meaning: But my feelings for you are honest and real.

And all my heart belongs to you.
Meaning: My entire heart is yours.

No melody, no perfect rhyme,
Meaning: I can’t offer you a perfect song or poetry.

But I’ll be yours through every time.
Meaning: But I will always be there for you, no matter what.

So if a song you want from me,
Meaning: If you want me to express love like a song,

Let my love be the harmony.
Meaning: Then let my love itself be the beautiful music you hear.