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Advise me where you can find high-quality music that will be used for commercials. It must be copyright free. So that we do not have problems later.

I tried to find services that post music for free, but there is a very small selection of music.  And the choice of music directions is small, it's difficult in general.

You're right that the choice of music is small, it's not often possible to find a large selection of different directions on the services. But it is still possible to do it. The main thing is to go through the list with the best applications in which you can find copyright-free music. I can share with you service that I sometimes use myself. Here I often find no copyright music - the choice of music categories there is very large. It is easy to find music for any task.