Copyright.... hummmm
Well, you do know that as soon as you record it or put it on paper (or electronic medium) that it has a copyright automatically ....right?
With the advent of the computer, all files, when created are given date stamps of creation. In addition if you upload the files to a file server in the cloud, that server also date stamps the file upon arrival.
OK, so to address your question, yes, you can send all the files to the LOC (Library of Congress) which is the only legitimate copyright office as far as the US court system is concerned....and pay one small copyright registration fee to cover them all in a collection. To file a claim of copyright infringement in court the LOC copyright is needed.
To the next issue: Unless you are the writer of some previous hits, the need to copyright your music is nearly non-existent. As hard as it is to get a publisher or A&R person to listen... just listen to one of your songs these days, no one is standing in line to rip off your music.
I send music to publishers and libraries and more than one of them has asked me not to copyright the songs in advance and not to register them with my PRO. The publisher will handle BOTH of those registrations and it won't cost you a dime. So it's literally been years since I last registered a song with either. Last time I looked in on my PRO account, I saw where my newest library had dropped around 40 new tunes into the account..... If you don't trust the person you're doing business with, why are you doing business with them?
Since I have Masterwriter software (cost $200) and it came with a lifetime subscription to Songuard Service, I do use the service. I am able to send any MP3 with or without words to the server and it keeps track of the song's date stamp in the very unlikely event that someone does rip it off.
At the Nashville Songwriter's meeting just last week, this very topic came up. And all the writers in the room who were pitching cuts to Nashville publishers agreed that LOC is a total waste of time and money. No one registers their songs for copyright for the reasons I mentioned.
Of course, some folks who don't understand the reality of the music biz, might be a bit uncomfortable with sending unprotected songs out the door, so to them...(you?) I simply say, if it makes you sleep better at night, go ahead and register them, but for goodness sakes, do it as a collection so it doesn't cost quite so much.
Really, I wish someone would steal one of my songs and make it a huge hit....... There are a bunch of music lawyers who would be "very interested" in handling that case for me for a cut of the action......
So no, I do not go that route.....