The Yardbirds were a band with a split personality. A sift through their albums shows them to be tightly focused blues purists—doling out the muscular R&B of “Drinking Muddy Water”—who would also indulge in the sweet power pop of “Ha! Ha! Said the Clown,” the folkish introspection of “Puzzles,” and the exploratory freakbeat of “He's Always There.”