The latest from Dillon and Batsauce is a call to arms with a guest turn from one of the more esoteric hip-hop artists of all time: Kool Keith. “Ready on the Left” is fueled by a magma-deep ostinato bass line anchoring swirling samples and chiming chords; peppered with blink-and-you’ll-miss-them processed-and-decaying tones and single percussive strikes. Savvy and mellow-boast rhymes abound …