Copyright
Under US Copyright Law, copyright attaches as soon as a work is created, whether published or not. Published or unpublished works do not need to be "signed" to fall under copyright protection because the creation of a work already establishes copyright ownership.
Copyright attaches automatically as soon as an original work is made public. There is no fee or registration process required.
Be Here Soon was created in 2008.
Soon - EP - was created in 1997.
Soon - musical - was created in 1971.
Soon Forgotten was created in 1996.
Real Soon was created in 2005-11.
Soon After Silence was created on 2007-05-14.
Soon We'll Be Found was created in 2007.
Soon It Will Be Cold Enough was created in 2006.
So Soon We Change was created in 1979.
Darlin' Be Home Soon was created in 1966.