Jimmy Reeds success and popularity effectively boiled down to the simplicity of his style; his version of the blues was accessible to all and sundry, with everyone from Elvis Presley to local groups recording or performing his songs, thus further popularising both the singer and his catalogue.   Ultimately, Jimmy Reed sold more records than Muddy Waters, Howlin Wolf or any of his blues contemporaries, although success came with its own share of problems, including alcoholism and epilepsy that bedevilled his career.   Yet as far as his recordings were concerned, he was without equal, as this collection of greatest hits proves beyond all doubt.