Founder Al Kooper conceived Blood, Sweat and Tears as an experiment in expanding the size and scope of the rock band with touches of jazz , blues , classical , and folk music. When Kooper was forced out of the band soon after its eclectic debut, Child Is Father to the Man, BS&T became increasingly identified as a "jazz-rock" group, although its music was essentially easy-listening rhythm and blues or rock with the addition of brass.

Kooper formed BS&T after leaving the Blues Project in 1967.