The guitarist was recognised as much for his powerful, gruff vocals as his musicianship and was known for playing with picks on both the thumb and index finger of his right hand.

BBC: Magic Slim, American blues musician, dies aged 75

Andy Grove noticed an occasional tremor in the index finger of his right hand. it was 1999, when Grove was 63 and had just stepped down as the chief executive of chipmaker Intel.

FORBES: Magazine Article

Andy Grove noticed an occasional tremor in the index finger of his right hand. it was 1999, when Grove was 63 and had just stepped down as the chief executive of chipmaker Intel (nasdaq: INTC - news - people ).

FORBES: Andy Grove's Last Stand