Slightly Out Of Tune

Love is like a never ending melody,
Poets have compared it to a symphony,
A symphony conducted by the lighting of the moon,
But our song of love is slightly out of tune . . . .

Once your kisses raised me to a fever pitch,
Now the orchestration doesn't seem so rich,
Seems to me you've changed the tune we used to sing,
Like the bossanova love should swing . . . .

We used to harmonize two souls in perfect time,
Now the song is different and the words don't even rhyme,
Cause you forgot the melody our hearts would always croon,
What goods a heart that is slightly out of tune?

Tune your heart with mine the way it used to be,
Join with me in harmony and sing a song of love,
We're bound to get in tune again before too long,
There'll be no Desafinado when your heart belongs to me completely
Then you won't be slightly out of tune, you'll sing along with me!

Thank YOU for the clue