I know you want to hear different but it's illegal to use copyrighted music without paying the owners. Those YouTube users who do not opt to set their video to

I know you want to hear different but it's illegal to use copyrighted music without paying the owners. Those YouTube users who do not opt to set their video to private are doing it illegally. Fair use fro educators depends on several factors which I don't think are in your favor. One, fair use limits the percentage of material that can be used, and two, fair use must not hurt sales of the music. With your users likely uploading whole songs, and having the option to obtain paid licenses just like those for dance teachers and studios, either pre-condition is questionable. BMI, ASCAP, and SESAC are the 3 orgs for the publishers, composers, and lyricists in the United States and they do expect choreographers and dance instructors to have licensing to use the music (Grand Rights). So do recording companies if you plan on using pre-recorded music. You could contact them and see what they offer. Otherwise, you could make the choreos available to logged in users only. Private exchange of videos may be ok, plus it's much less likely the publishing companies will find out.