Matthew Jefferson, also known as Kemba, formerly known as YC the Cynic, (born November 21, 1990) is an American rapper from Hunts Point, Bronx, New York.

He was named one of the "Top 5 Underground Hip-Hop Artists in New York" by Deli Magazine (2010) and was ordained "DXNext" by the hip hop website HipHopDX (2011).

"[3] DJBooth.net declared “YC’s heavily-alliterated, elaborately-rhymed flows are undeniably dope.”[4] You're Welcome served as a great look into the talent and potential of the up-and-coming emcee.

Derick Fortin of LA2Day said "Fall FWD’s lyrical complexity, aesthetically pleasing flow, diverse subjects, and experimental production is everything true hip-hop fans have been looking for"[5] while JT Langley of Oology says "lyrical content aside, YC shares himself as a patient slow-paced linguist throughout the tape, focusing with precision to weave commentary among clever metaphor, while riding a loose rhyme-scheme that holds the ability to evolve smoothly at the turn of each verse without any obvious signifiers.

In March 2011, YC the Cynic wrapped a nationwide tour with J.Live that included six performances at the SXSW Festival in Austin, Texas.

[8] Only nine days after the interview was uploaded to YouTube, Kendrick Lamar invited Kemba on to the stage to rap at Brooklyn's Music Hall of Williamsburg for an American Express sponsored concert that was live-streamed on Facebook.

[11] In 2019, he was featured on the final posthumous album from the late Floridian rapper XXXTENTACION, Bad Vibes Forever, with fellow New York native, Joey Badass.

Created in March 2009 by the hip hop duo Rebel Diaz, the Rebel Diaz Arts Collective (RDACBX) is a hip hop community center that utilizes all five elements to spread their message about the injustices faced by oppressed groups while providing a safe haven for young people to perform and learn.

"Cee-lo use of melody, song-writing ability, and just the strength and feeling of the words he chooses is pretty invaluable," says the Bronx native.