Do you want to PUT your own songs into Jukebox but didn't know how to do it? Here is explanation:

Go to:
C:\Program Files (x86)\SteamLibrary\steamapps\workshop\content\294100\3380695249\Sounds\Jukebox\ (PASTE YOUR SONGS HERE)

Do not do it while Game is on (u need to reload the game anyway and u wont be able to transfer files over there since game is running)

(You can also go to Rimworld, Properties, Browse Local Files and then just go back till Workshop tab and follow the guide above for easier way to find it)