England's the Spencer Davis Group will forever be remembered for their anthemic mid-1960s R&B burners "I'm a Man" and "Gimme Some Lovin'," and as the training ground for a young Steve Winwood, whose superlungs gave those songs their fire. Though Winwood left the band to form Traffic in 1967, and would go on to have one of rock's most storied careers, the SDG continued to write, record, and perform without him for years to come, dabbling in psychedelia and jazz-rock, among other forms. Davis kept the group alive and well with various revamped line-ups into the new millennium as they remained a fixture on the oldies-festival touring circuit.