Scraping away Rush's prog complexity reveals a classic power trio grounded in hard rock. In the early '70s, they specialized in jams like “In the Mood,” which were built from shrieking vocals and a bluesy wallop inspired by Zeppelin. Yet even as veterans, they enjoy a good riff workout: hear the grunge-inspired barnstormer “Stick It Out” and their fuzzy, overdriven take on Blue Cheer's proto-metal classic “Summertime Blues.”