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 Published or unpublished works do not need to be "signed" to fall under copyright protection because the creation of a work already establishes copyright ownership.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 Forgotten was created in 1996.
Soon - musical - was created in 1971.
Soon - EP - was created in 1997.
Real Soon was created in 2005-11.
Soon We'll Be Found was created in 2007.
How Soon Is Never was created on 2003-09-23.
Too Soon to Love was created in 1960.
Darlin' Be Home Soon was created in 1966.
So Soon We Change was created in 1979.