John Mayall was a pioneer in the blues-rock-fusion world. His recordings featured an ever-changing lineup of future stars, usually referred to as Bluesbreakers. The solution to the following puzzle tells about several of Mayall's sidemen and the accomplishments which later brought them fame.
A cryptogram is a simple letter-substitution code, with a given letter standing in place of another throughout the text. PLAY DOGOFF might be a cryptogram for JOHN MAYALL where P translates to J, L to O, A to H, etc. (That is not the scheme used here, but the code is the same for all seven statements.) Proper nouns, i.e. names of individuals and groups, are underlined.