Beginning as one of rock's all-time great (and influential) blues-rock bands, the Yardbirds had taken a turn toward the psychedelic side of things once Jeff Beck replaced Eric Clapton, as evidenced by 1966's Over Under Sideways Down. As with Beatles and Rolling Stones albums from around this era, the U.K. and U.S. versions would often differ with album titles and altered track listings, and as a result, quite a few tracks slipped through the cracks. The same was true of the Yardbirds.