Bert Weedon, a British guitarist whose “Play in a Day” guitar guide taught the instrument to a generation of young hopefuls, died on Friday at his home in Beaconsfield, in the English county of Buckinghamshire. He was 91.

BLACK SABBATH bassist Geezer Butler has posted the following message on Weedon‘s passing: “I had stopped commenting on deaths and disasters, because my [online] ‘journal’ was starting to resemble an obituary column. However, I cannot ignore the passing of Bert Weedon. Some of you won’t have heard of him, but I can safely say that many U.K. and Ireland guitarists from John Lennon onwards throughout the 1960s and ’70s would probably have never learned to play without Bert Weedon‘s ‘Play In A Day’ book. He produced a book with pictures of chords, rather than musical notation, making it possible for those of us who couldn’t afford music lessons, or didn’t read music, to gradually learn basic chords on the guitar. I know BLACK SABBATH wouldn’t exist without his book, since both Tony Iommi and myself learned to play guitar chords from it. RIP Bert!”