LONDON – Spencer Davis, a British guitarist and bandleader whose eponymous rock group had 1960s hits including “Gimme Some Lovin’” and “I’m a Man,” has died. Davis’ agent, Bob Birk, said Tuesday that he died in a hospital while being treated for pneumonia. He formed the Spencer Davis Group in 1963, with a teenage Steve Winwood on keyboards and guitar, his brother Muff Winwood on bass and Pete York on drums. With Steve Winwood as lead vocalist, the band had two No. Davis released several solo albums without recapturing his 1960s fame, and later reformed the Spencer Davis Group without the Winwood brothers.