The song itself is in the public domain, but certain arrangements, performances, and recordings may have their own protection.
The Real American Folk Song - is a Rag - was created in 1918.
Rag Doll - The Four Seasons song - was created in 1964-06.
Clemson played it in 1942.
The cast of Tiger Rag - 1989 includes: Ludvig Bell as Kalle, 9 years old Sven Melander as Hugo Per Morberg as Ingvar
That would be copyright infringement if the original song was protected.
You can only copyright a song if you are the song's author. You can't copyright someone else's song. Although the author can sell you their copyright.
Each song has its own copyright year.
Frankie valli and the four seasons sung rag doll
It is probably copyright infringement. There are exceptions, though.
The only way to be certain is to contact the copyright holder yourself.
Easy Tiger - song - was created on 2008-03-10.
If you are not the composer of the song then you can NEVER take the copyright as yours; you would have to purchase it from the copyright owners. Also, when the copyright expires, 50 or more years after the author's death (or after publication, depending upon circumstances and national laws) it is no longer copyrighted at all and nobody can possibly own the copyright.