Here are some resources where you can find royalty-free music for your game:
Open Game Art: https://opengameart.org
Open Game Art is a community-driven platform where artists and musicians share their work for free. You can find a wide variety of music tracks in different genres and styles, all of which are available for you to use in your game without worrying about copyright issues.
Jamendo: https://www.jamendo.com
Jamendo is a platform that hosts royalty-free music from independent artists. You can listen to and download tracks for free, and you can also use them in your game as long as you properly credit the artist.
SoundCloud: https://soundcloud.com
SoundCloud is a popular audio platform where users can upload and share their music. Many artists on SoundCloud make their music available for free use, and you can find a variety of tracks that you can use in your game. Just be sure to check the licensing terms of each track before using it.
Freesound: https://freesound.org
Freesound is a community-driven platform where users share sound effects and music for free. You can find a wide variety of sounds that you can use in your game, including everything from footsteps and explosions to ambient noise and character voices.
Remember* to always check the licensing terms of any music before using it in your game to ensure that you have the proper permissions and are complying with any applicable laws.