I am currently in development of a free mobile game (no ads). It is a music mixing game. Are there any legal actions I would need to take to use commercial music in my game? Please let me know if you need any more details.
You would need to pay royalties for any music that is under copyright (i.e. most music). The peak recording body in you country usually has a scheme which allows this to be done efficiently.
You can try to contact owner of the music rights and then use it with his consent.