In a very old interview done by Guitar World, Tony Iommi looked back on Bill Ward finding it difficult to play songs.
“During “Master of Reality”, we started getting more experimental and began taking too much time to record.”
“Ultimately, I think it really confused us. Sometimes I think I’d really like to go back to the way we recorded the first two albums [‘Black Sabbath’ and ‘Paranoid’].
“I’ve always preferred just going into the studio and playing, without spending a lot of time rehearsing or getting sounds.
“We tried recording ‘Into the Void’ in a couple of different studios because Bill [Ward, drums] just couldn’t get it right. Whenever that happened, he would start believing that he wasn’t capable of playing the song.
“He’d say, ‘To hell with it – I’m not doing this!’ There was one track like that on every album, and ‘Into the Void’ was the most difficult one on ‘Master of Reality.'”