Collin Grimm built a real hip-hop career first — conscious, wordplay-heavy rap that got him work with Snoop Dogg, Action Bronson, Lil Dicky, and Chance the Rapper — before Rusko's "Woo Boost" pulled him toward dubstep and production entirely.
As ProbCause, he's kept the rapper's ear for a hook while building tracks with Levity, Big Gigantic, and Liquid Stranger, and HEATWAVE, his recent dubstep EP, is the clearest evidence yet that the pivot from rap to bass music wasn't a phase — it's the whole second act.