: This does not mean the music is free. It means you pay once (or via subscription) and don't have to pay a "royalty" fee every time someone watches your video.
: Sites like Foximusic allow you to buy individual tracks for a one-time fee, providing a license for unlimited use in monetized content. buy copyright music for youtube
: Use YouTube Studio's search feature to check the rights of a song before uploading. : This does not mean the music is free
: The YouTube Audio Library provides a massive directory of royalty-free music and sound effects that are "copyright-safe" and free to use within the platform. : Use YouTube Studio's search feature to check
How to Use Music in Videos Legally - Universal Production Music
: Music where the copyright has expired. These are free to use, but be careful: while the composition might be public domain, a specific recording of it might still be copyrighted. Avoiding Copyright Strikes