Don't get it confused guys. The "right to copy" is only interesting as far as allowing someone.........."to copy" (make copies of/redistribute in some or other medium) your composition. The composition as such is your intellectual property (copyrights can be sold in the US (the only country in the world LOL@exploiting artists), the intellectual property can only be licensed in form of a copyright.
So having a Youtube channel and uploading your composition, setting the upload/channel to private, is a good step. Also creating an email account with your government name (John Smith@gmail.com) and sending the archived and locked (password) composition/session files to it can provide an additional digital "timestamp" and "proof of ownership" (as far as the time of creation vs. release by a third party, which stole your work/uses it without permission, goes).
In the end, registering it the "proper" way just ensures that everyone understands the channels/steps the composition went through before being released, but per se, doesn't change your rights on your own intellectual property.
Additional proof of intellectual property ownership is never a bad thing.