Ciao Mauro. The title of this Beatles song came from a Jamaican Reggae band called "Jimmy Scott and his Obla Di Obla Da Band." The Beatles got copyright to use the band's title for their song. Paul McCartney, explained it "A fella who used to hang around the clubs used to say in a Jamaican accent, "Ob-la-di, ob-la-da, life goes on bra,". In this song the word "bra" is the Jamaican way of saying "bro" meaning brother.