Amid the relentlessly creative song-oriented drumming on Grizzly Bear’s 2017 album, Painted Ruins, the track “Aquarian” stands out as particularly percolating. It’s got the flowing, forward-motion feel of paradiddle-based phrases dancing by in spiraling patterns that might bring to mind a slower, more organic version of drum ’n’ bass. I imagined Chris Bear sitting at his kit and figuring things out precisely, finding exactly where, and where not, to place the little rhythmic curlicues that animate the beat. I sure was wrong about that.