Ok I know I like just posted this but Im making this post again in case anyone didnt respond to my last post cus they saw someone replied. I didnt actually get the answer from that reply . So heres the post again. 

Ok I know it is kinda said but I just want to be totally sure im understanding this right. In the rules it said anything you have the legal rights to is fine but anything not made by you should be credited in the description. This means that I can use music from other games as long as I list it in the description right. Like I said I want to be sure

So ya, if you know please tell me. If you dont know, dont reply to this post

You can use music from other games as long as you have permission from the copyright holder to use their music, yes.  If you don't know whether you have permission to use a particular song, then then answer is probably no.

There is a lot of licensed music included in Flowlab, and a lot of Creative Commons licensed music here on Itch as well, if you are looking for music to use.