There are websites out there were you can use music for free. (A simple google search should do it.) But just make sure it says you can use it! And don’t rip any music that is copyrighted.
Also, make sure to name your thread about what you need help with. It makes it much easier for someone to help you.
Have a good day! 
EDIT: This seems like a pretty legit site. ://www.freesound.org But read the FAQ! Not all of it can be used in games! (There are other sites. But I don’t know them As I make my own.)