21 Savage
He became known in Atlanta for the 2015 mixtape "The Slaughter Tape" before attaining nationwide attention following an EP collaboration "Savage Mode" ( 2016 ) with the producer Metro Boomin and its popular singles "X" and "No Heart , " as well as guest features on the 2016 Drake single "Sneakin' and the 2017 Post Malone chart-topping single , "Rockstar . " 
<triplet> X <subj> Savage Mode <obj> part of <subj> Metro Boomin <obj> performer <subj> No Heart <obj> followed by <triplet> No Heart <subj> Savage Mode <obj> part of <subj> Metro Boomin <obj> producer <subj> X <obj> follows <subj> Sneakin' <obj> followed by <triplet> Rockstar <subj> Post Malone <obj> performer