I am not sure if this the right place to ask for this, but I was curious if anyone knew of a website similar Unsplash but that focuses on music beats or soundtracks for commercial use. I would help me a lot.
NoCopyrightSounds on YouTube is pretty good, but usually you have to credit the artist. You can send them an email though and sometimes they give you a permission to use it without crediting.
Epidemic Sound. Not free, but very simple usage rules. https://player.epidemicsound.com/#/browse/