 Osbourne Ruddock ( King Tubby) was a Jamaican sound recording engineer who created vocal-less rhythm backing tracks that were used by DJs doing toasting by creating one-off vinyl discs (also known as dub plates) of songs without the vocals and adding echo and sound effects.Late 1960s toasting deejays included U-Roy and Dennis Alcapone, the latter known for mixing gangster talk with humor in his toasting.In the early 1970s, toasting deejays included I-Roy (his nickname is in homage to U-Roy) and Dillinger, the latter known for his humorous toasting style.