John Cena actually sings his own theme song and is the first to do so
John Morrison's theme song is called Ain't No Make Believe by Stonefree Experience
John Cena sings his all theme songs.
John Boutte
It is called Aint' No Make Believe
john sings it himself
Dr. John
John McLaughlin
its "Don't Question my heart" and by kyle Morrison i think
sounds a lot like Dr. John
Rev Theory sings the theme song.
His current theme song is "Ain't No Make Believe"