Finding Sheet Music

Hello Everyone in TONBASE land! Recently, as I have been listening to new playlists of Classical music, there have been a few songs that I have heard that I would love to learn but can't seem to find the sheet music for. I anyone has heard these songs, or knows where I can find sheet music for them, please let me know!

Here are the YouTube links for a couple of the Songs:

Rameau: Musette en rondeau - YouTube

Haydn: Piano Sonata in D major, XVI:4 - 1. Moderato - YouTube

God Bless,

JJ.