if i haven't registered my music, and someone else does without my permission, what are my rights.

There are all kinds of issues when dealing with minors, including that without State Supreme Court approval contracts may not be enforceable. What the status of your intellectual property may be is not easily answered in this type of forum. Generally, you don't have to cpoyright a work with the copyright offcie to have copyriht in the material. Physically registering it just allows you to prove when you created the work and allows you to file a Federal lawsuit to enforce your rights. It also allows you to seek "statutory damages" and maybe even recover attorney's fees and costs. To protect yourself, and to the extent it would be permitted by law, you may want ot now begin registering those works. You should sit down in a consultation with an attorney in your area to discuss. You can email me at omichelen@sbmlegal.com or call my office at 1-800-640-2000 to schedule an appointment

The following is intended to be instructive in nature, and does not constitute legal advice.

You acquired a copyright, as a matter of law, when you created your work. Unless you granted rights to your client in your contract with them, their use of your material will likely be copyright infringement.

A copyright registration, by itself, does not necessarily violate your rights. However, depending on the facts in play, their copyright registration may be invalid for failing to acknowledge the pre-existing material that you created, or it may be invalid as an unauthorized derivative work.

In any case, you should consult an attorney to review the applicable contract and the other circumstances of your case.

You need a lawyer - there are too few facts to give you any real advice.