When drill erupted out of Chicago three years ago behind the rise of Chief Keef, the infamous MC brought his close circle of friends with him into the limelight. Many inked deals with major labels, though Sadiki Thirston, aka SD, went indie—he’s released a string of Life of a Savage mixtapes and a studio album, November’s Truly Blessed, which he put out through LA’s IHipHop Distribution. SD’s name is less recognizable than, say, fellow drill rappers Lil Durk or Lil Reese, but SD is exalted among hip-hop heads who follow this scene closely. SD is a known entity, but some people talk about him like he’s this city’s best-kept rap secret.

Drill’s boom eventually went bust, at least in terms of its position as a crossover major-label phenomenon. Chief Keef’s fallout with Interscope in the fall is the end of this particular chapter for drill, though the genre is far from over—Keef and his Glo Gang (aka GBE) affiliates still command a strong following even without the backing of a major label. And SD has shown how to maintain a career and cultivate an audience on an indie level.

SD’s take on drill is uncomplicated and forthright, and he exerts an expert grasp on a sound that can inflict chaos. On “Circles,” one of the singles from Truly Blessed, SD raps blunt, stark lines with a sinister drowsiness; he sounds relaxed, but ready to pounce at a moment’s notice, and his subtle inflections keep you on your toes.

On the new Life of a Savage 4 SD explores a depth of emotions within the confines of his vocal range. On “I Wonder,” produced by shit-hot Atlanta beat maker Metro Boomin, the 20-year-old MC mulls over the endless—and potentially grim—possibilities of his life in the complicated manner of someone going through a midlife crisis. His future could be stellar, but SD sees potential pitfalls all around him. Yet if he keeps making tracks like “I Wonder” then I bet SD’s future will remain bright.

SD performs tomorrow night at Lincoln Hall as part of the latest Fake Shore Drive showcase. Cam’ron headlines and ShowYouSuck also performs; the show is $3 with an RSVP. It starts at 7 PM, but I’d show up early to make sure you get in.

Leor Galil writes about hip-hop every Wednesday.