Laguna Greg, are you a lawyer? And if so are you registered world wide to provide advice?
otherwise it would be wise to add something like "I'm not a lawyer and my advice cannot be held as responsible for any actions taken", etc...
So... now to your advice.
I don't think you're wrong, but you're over reacting, once more, for something that's quite simple. Plus you're leaving quite a few gaps about many things that you say...
Candywoman, if you really want to protect your rights to that arrangement you put together, you should file a copyright application with the U.S. Trademark and Copyright Office for it. It's not too late to do so and still protect your ownership of any copies. You fill out a form, send in two fair copies, and a check for the very modest fee, if you haven't already. If you make any further changes to it, file new applications as the work evolves.
The registration to the copyrights office (www.copyright.gov
) is necessary if you're actually serious about your work. But legally speaking it's not necessary to register a work. The work is already copyrighted according to the Berne Convention with the appearance to a tangible means! (this means that you cannot copyright a music idea (a theme) that you have in your head, but you can copyright it, if you write it down into paper, or a recording, or a midi file, etc. As long as there's enough "skill" and "originality" to that.
Now, an arrangement is a little weak to begin with, but you can copyright your creative part in that work (the arrangement).
BUT, to be fair, while copyright is automatic (check the above), the enforcing part is much more difficult and this is where the copyright office of the USA comes into play. This applies ONLY to US courts, but any copyright infringement is an issue to a Federal court and not a State court. And no federal court will accept a copyright claim without the work being registered through the copyright office.
If you want to protect your rights to the performance of such a work, join ASCAP or BMI and file the work with them. You have to be a member in order to protect or control the performance of any of your original work, and get royalties or performance fees. If you don't, your work is unprotected in regards to its live performance or recording.
Again, not quite clear.
Yes, ASCAP, BMI and any other PRO (Performing Rights Organization, like SAGEM, GEMA, AEPI, STIM (to name a few)) will cash in the money to the writer and the publisher of a work performed live, or recorded, etc, but it doesn't "protect" it, if you mean it as in "Do NOT perform the work". The copyrights is enough to stop someone from performing your work (though it sucks to do so)...
I have been dealing with getting a license to use an arrangement of a work by Prokofiev (there's actually a thread about this somewhere here), and ultimately I had to reach out to the copyright holders (publishing house) as well as the Prokofiev Estate (ethical part, if you want to call it that).
Same goes for a composer of EMF, who's done a set of 32 variations on a theme of Theodorakis (well known Greek composer...). I had to grab a license from Theodorakis himself not AEPI (the local PRO).
Also, one should note that PROs have very little deal with the Internet in general. Youtube, Shazam, pandora, Last.fm, etc do NOT provide royalties! (sadly)... They do provide an option to monetize your videos (as youtube says), but it's got nothing to do with PROs! Same, actually, goes for computer games! I've never ever gained a single dime from royalties from computer games. I have gained % from sales, but that was in the contract and no PRO was there to help me gather that.
I'm not a lawyer, but that's my understanding of things!
Now to the issue in question.
Candywoman. It is like most say: It's no biggie and the video will disappear from the radar very soon. It's a little unfortunate that the parents decided to post the video. I think that if I was in their shoes I would've asked the teacher first.
But since it's done, it's done. You can ask them nicely (what Leguna Greg says pretty much) and you can draft some kind of rules, or add them to your existing agreement, to make sure that the parents and students know about this.
Other than that, I'd be quite curious to see it myself!