Hip-hop and R&B offer some of the most fluid, dynamic sounds today, true barometers for where the culture is at and where it’s going. This week, headlining #OnRepeat—a playlist chock-full of the hottest new songs we can’t seem to stop playing—is the Tee Grizzley and J. Cole collaboration “Blow for Blow”. If those were two names you thought you’d never hear rapping together, you’ll be even more surprised—and delighted—to hear Cole aping a classic Mase flow here. Check out several worlds colliding on “Blow for Blow” on #OnRepeat, and if you hear something you like, add it to your library.