Coolness factor: 100 With all the coolness associated with Isaac Hayes — the voice behind the Blaxploitation classic Shaft — it’s easy to forget that he was also a musical innovator. At a time when progressive rock bands in Britain were primarily embracing the long song format, he released Hot Buttered Soul, an album featuring only four tracks, two of which are well over 10 minutes long (the opener 'Walk on by' and the closer 'By the Time I Get to Phoenix'), one just under that length ('Hyperbolicsyllabicsesquedalymistic', 9:10 minutes) and one at 'just' 5:10 minutes ('One Woman'). It should have been commercial suicide, even in the world of soul music. Instead of flopping, however, Hayes's first masterpiece expanded the genre and opened up new avenues for it in the coming decade. Ironically, it was this unusual album that made him a star of black music, and skilfully edited singles then ensured commercial success in the charts. A milestone from a giant of soul music.