Epistula Amoris

It is often said that French is the Language of Love, but before there was even a French Language- It was _______. Hence the title, also if you manage to fill in the blank and decode it then I hope you continue reading it.

Playlist

"Capital letters" - Hailee Steinfled
"King of my heart"- Taylor Swift
"The Scientist"- Coldplay
"Between the stars"- Elliott Smith
" Hawayein"- Arijit Singh