However, his factory foreman insisted on playing him a recording of jazz guitarist Django Reinhardt. While Iommi was impressed with the abilities of Reinhardt, he was inspired when he learned that Reinhardt had only two fingers with which to play his fret board.
Ionni returned to his guitar and later went on to form Black Sabbath with Ozzy Osbourne, Geezer Butler and Bill Ward.
Ionni's injury meant he needed to place custom made thimbles over the tips of his damaged fingers. This made it difficult for him to feel and bend the strings. To combat this issue, Ionni would de-tune his guitar to make the strings easier to bend.
This "heavier" sound initiated by Black Sabbath became the trademark sound of the 70's and 80's heavy metal bands.
