Ka developed and, over the course of eleven fiercely independent, self-released and mostly self-produced full-length albums, perfected a style nearly unique in hip-hop: hushed but intense, knotty and dense with multiple entendres, rhymes and allusions, often circling around the question of how to live a righteous life after a childhood of hard-earned survival. This quote—which begins Tiny Mix Tapes's 5-star review of Days with Dr. Yen Lo, Ka's album-length collaboration with the producer Preservation—sums it up:

On “Day 811,” Ka spits, “When you’re raised around rage and vengeance/ You can change, but in your veins remains major remnants.” It’s the type of rhyme that, coming from someone else, might be used to put an exclamation point on an entire song, an “Oh shit!” moment typically reserved for the end of a track. From Ka, it’s bars 13 and 14 of a 24-bar verse.

Ka's music can be purchased as digital files from his website. He also has many videos on YouTube. A small selection of songs I have personally enjoyed: Peace Akhi — Day 81 — Just

Other tributes and retrospectives from around the web:
Hearing Things, "Ka Gave All of Himself at His Pop-Ups"
Pitchfork, "The 10 Ka Records That Defined His Legacy"
Stereogum, "Ka Dead At 52"
Hip Hop Golden Age, "Ranking Ka's Albums"
The Fader, "New York Rap's Greatest Living Treasure" (from 2016)
Vulture, "Ka Was A Superhero"