Spencer Davis Group - I'm a Man

With the amazing Steve Winwood,his ferocious soul-drenched vocals belying his tender teenage years.
With this single, the Spencer Davis Group were taking their blue-eyed soul to progressive, eclectic extremes, devising a foreboding, progressive sound of their own.
A couple of years later, Chicago did an extended version of "I'm a Man" on their debut album (when they were still known as the Chicago Transit Authority) and took the song into the Top 30.