https://www.youtube.com/watch?v=pN2kVgQh5N4
For the first part, it's just an instrumental with humming. this is the person humming along to their favourite song. the setting is 1800's france. the person is thinking of someone they love, the song reminds them of that person. when the singing stops, the person gets up and starts dancing in a ballet-like style. they are moved by the beautiful sound of the music. then, on the next part of the song, the person starts to sing again, this time, with words.
"je te laisserai des mots" / "i will write you notes"
The person is going to write their crush notes, in hopes to spark some romance. while they are still listening to the song, they sing about how they feel and what they're going to do.
"en-dessous de ta porte" / "underneath your door"
The person will leave the notes underneath the door so that their crush will see them. they feel this will make it more romantic.
"en-dessous de la lune qui chant" / "underneath the singing moon"
The person takes time to stop and admire the beautiful night sky, and how the moon seems to sing to them from the sky above their crush's door.
"tout près de la place où tes pieds passent" / "near the place where your feet pass by"
The person is referencing the path that their crush takes to get to school/work, and how they see them pass by there often.
"cachés dans les trous dans le temps d'hiver" / "hidden in the holes of wintertime"
It's wintertime, so the path their crush takes is hidden under snow, with holes where feet have stepped, marking where it is.
"et quand tu es seule pendant un instant" / "and when you're alone for a moment"
"embrasse moi" / "kiss me"
"quand to voudras" / 'whenever you want"
The person is longing for their crush to kiss them, and they would like it to happen whenever their crush felt the time was right, and they were alone together.
That last part repeats a few times, then switches back to just music. during the last stretch of music, the person goes to leave the love notes under their crush's door. the faint singing is the winter wind blowing. on the last two notes, the person takes a somewhat relieved sigh, and awaits the results of their love notes.