There are at least 22 songs by that title registered with BMI.
"I Won't Complain" was written and recorded by white gospel singer Donald Lawrence as "I Can't Complain." The rights are controlled by EMI Christian Music Group.
Nobody owns the copyright of a single word. Perhaps you mean trademark.
the coca cola company owns the copyright
A minor owns the copyright on any works they create.
Universal.
Word Music.
Paramount.
Rankin/Bass.
Rondor Music.
There are 24 different copyright-protected items by that name.
The phrase "copyright obtained" doesn't give any indication of who copyright might be assigned to.
You can't. It is a right that the writer owns. You can offer to buy the copyright.