Itchycoo Park, 1964-1970--the second volume of Sixties British Pop, Outside In--explores how London songwriters, musicians, and production crews navigated the era's cultural upheavals by reimagining the pop-music envelope. As the generation born during the postwar years approached adulthood, they gravitated to music that resonated with their lives. Mainstream pop remained true to the basics, but some British artists conjured up sophisticated hybrid...