When Mark Baumgarten edited now-defunct Sound Magazine and indulged my interest in the city’s grunge-era glory, he didn’t seem as especially interested in what had come before. He had the pulse of Northwest folk artists and fresh singer-songwriter types, and knew the up-and-comers in just about every genre. With Love Rock Revolution: K Records and the Rise of Independent Music, he proves he is indeed tuned in to local music history, immersing us in a richly-detailed and accessible portrait of Olympia’s ’80s and ’90s indie scene and its champion, Calvin Johnson.