Hi am 13 years old and its my first game jam me and a friend are going to team up, but i am not sure if we can use copyrighted music (its from another game that published 14 years ago we are not planning to earn money or publish it for buying or anything we will just use it for this game jam (its actually a credit song and we will just use the music of it not words just music) so.... Can we use it? Or do we have to make the music ourselves? Or can we if it wasn't copyrighted? Thank you for your time

I'm not sure but I think you have to use music without copyright-

The rules state that "you can also use assets not made by you, but make sure you have the proper license to use them and crediting is of course encouraged"

so basically id assume you can use copyright free music and assets. Just make sure you follow all ruled lined out by the creator, such as giving them proper credit