Amon Duul II came together in the late '60s after the real-deal musicians in Amon Duul ditched their communal brethren. Growing tired of all the tribal shenanigans, they wanted to rock out like pros, and that's exactly what they did. Phallus Dei, the group's debut, is a landmark in early, psych-tinged progressive rock. The arrangements and compositions are imaginative and well crafted, while the ensemble interplay is aggressive, bordering on manic at times. For the first dozen spins or so you'll have trouble making it past the opening title track, a 20-minute epic that's a joy to explore.