Before they conjured demons as Black Widow, before Sacrifice would scandalize and entrance the rock world, there was Pesky Gee! and their singular statement of transformation. Released on Pye Records in 1969, Exclamation Mark captures the precise moment when British club soul dissolved into something far stranger and more wonderful. This is the sound of metamorphosis itself: a typical U.K. soul band discovering the outer limits of consciousness, letting psychedelia and progressive impulses infil…