premise: Ian Gillan is a guitarist.
hypothesis: Ian Gillan ( born 19 August 1945 ) is an English singer and songwriter . After a short time away from the music business , he resumed his music career with solo bands the Ian Gillan Band and Gillan , before a year-long stint as the vocalist for Black Sabbath . He rejoined the band for a second time in 1992 for their twenty-fifth anniversary , and following the recruitment of guitarist Steve Morse in 1994 , has helped transform the group into a regular touring outfit , which he has fronted ever since .