* Freesound: This website offers a large collection of audio files that are all free to use, even for commercial purposes. You can search for music by genre, instrument, or keyword.
* SoundCloud: SoundCloud is a platform where musicians can share their music for free. While not all of the music on SoundCloud is royalty-free, many artists do offer their music under a Creative Commons license, which allows you to use it for free as long as you credit the artist.
* AudioJungle: AudioJungle is a marketplace where you can buy royalty-free music and sound effects. While most of the music on AudioJungle is not free, there are some free tracks available.
* Pond5: Pond5 is another marketplace where you can buy royalty-free music and sound effects. Like AudioJungle, Pond5 also offers some free tracks.
* Incompetech: Incompetech is a website that offers royalty-free music composed by Kevin MacLeod. All of the music on Incompetech is free to use, even for commercial purposes.
In addition to these websites, you can also find royalty-free music on YouTube and Vimeo. Many YouTubers and Vimeo users share their music for free, and you can often find tracks that are free to use even for commercial purposes.
When using royalty-free music, be sure to check the license to make sure that you are allowed to use it for your intended purpose. Some royalty-free music is only available for non-commercial use, while other music may require you to credit the artist or provide a link to their website.