CB Mass

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CB Mass
Also known as Critical Brain Mass
Origin South Korea
Genres hip hop, rap, K-pop
Years active 1998–2003
Labels Daeyoung AV
Associated acts Drunken Tiger, Epik High, Dynamic Duo
Members Choiza
Past members Vinnie
MC Shingun
Insane Deegie

CB Mass (Critical Brain Mass) was a Korean hip hop group featuring members Choiza, (real name - Choi Jae-ho), Gaeko (real name - Kim Yoon-sung) and Curbin. Choiza and Gaeko originally met in the sixth grade but before forming CB Mass they began an underground hip hop group named kod along with Sixpoint and ZASON, who joined in 1998. In the same year, Choiza and Gaeko met a fellow rapper Curbin and created CB Mass.

The group debuted in 2000 under Drunken Tiger's wing and released Massmediah to moderate success. In total they produced three albums: MassMediah in 2000, Massmatics in 2001, and Massappeal in 2003.[1] They disbanded later the same year after a heated and public dispute where Curbin was accused of stealing money from the group.[2] Their second album Massmatics was their most popular, with 120,000 copies sold in Korea.[3]

At the height of their success however there were continuous rumours that they would break up and their last album added weight to this speculation with just Gaeko and Choiza appearing on most of the songs. In the first song of Dynamic Duo's first album Gaeko raps "He liked standing in front of mirrors than music/ He worshipped cash more than friendship/ What he left with us is only betrayal," in a barely concealed reference to Curbin.[3] After CB Mass broke up, Gaeko and Choiza formed Dynamic Duo while Curbin announced plans to go solo but has not yet released any material.


Kim Yoon-Sung (Gaeko) was born in 1981 and went to Hongik University, famous for being an edgier university situated in the popular nightclub area named Hongdae, while Choiza (Choi Jae-ho) was a student of Sejong University.


Like many hip hop groups CB Mass collaborated with many other Hip Hop groups and individuals. In the song Jinja (진짜, meaning "real") they use the sample of Cheryl Lynn's disco classic Got to be Real for the instrumental. In this music video it features cameo appearances from members of The Movement, an alliance of Korean rappers, which was founded by Drunken Tiger, CB MASS, Uptown and Thanos.[4] Other contributions on their albums include appearances by 서영은, Zason, 양키, P-Da (Tim), Bobby Kim, Juvie, 신지선, Dope Boyz, 윤미래, 에스더, DJ Wreckz, Mikieyes, Sean2slow, Insane Deegie, Yoon Mirae, Lee Tzsche, 이세진, dj honda, parrish PMD smith, headcrack, Yoo Jin Ah, Lee Ju Han, JK Kim Dong ook, Hey, Sin Ye Won, and Epik High.

CB Mass also featured on the first two songs of Lyn's 2002 album Have You Ever Had a broken Heart?.


MassMediah (2000)
1. Intro
2. Final
3. 나침반
4. Smoke to Heaven
5. 서울 Blues (Feat. 서영은)
6. Massmediah (Feat. Zason, 양키, Bobby Kim, Juvie)
7. Running
8. The Movement 2
9. Count on!
10. Normal Life 2 Da 부르주아
11. 진짜 (For The Club) (Feat. 신지선)
12. 행복하면 됐잖아 (Feat. Bobby Kim)
13. 늘 어둠에 맞서 (Feat. Dope Boyz)
14. 주(酒)
15. Zoo
16. 불꽃 (Feat. 신지선, 윤미래)
17. Survival (Feat. Zason, 에스더)
18. 끙끙이의 거리 (Skit)
19. 창가
20. To Be Continue...2nd (Outro)

MassMatics (2001)
1.행진 (Feat. DJ Wreckx)
3.DJ Wreckx Interlude
4.CB Mass는 내 친구
5.Movement III (Feat. Drunken Tiger, Mikieyes, Sean2slow, Insane Deegie, Tasha)
6.흔적 (Feat with. Lee-Tzsche (이상은))
7.얕잡아 볼 수 없는 이유
8.셋부터 넷 (Feat with. 이세진 (린))
10.New Joint (Feat. DJ Honda, Parrish 'PMD' Smith, Headcrack)
11.Gentleman Interlude
12.Gentleman Quality (For The Club)
13.Sunshine Seoul (Feat. Yankie)
14.Watch Out

MassAppeal (2003)
2.동네 한 바퀴
3.서울블루스 Pt.II (Soulcity) (Feat. 웅산)
4.그 양반 이야기 (Feat. 유진아)
5.휘파람 (Feat. T, 이주한) (Assoto Union Version)
6.오아시스 (Feat. JK 김동욱)
7.노박사 심리클리닉 (Feat. 노홍철)
8.Mr. Liar
9.흔적 (Abstract Version)
10.In My Lifetime (Feat. Hey)
11.벗 (Feat. 신예원)
12.진짜 (Feat. 신예원) (Mo'Funk Version)
13.동네 한 바퀴 (Feat. Epik High) (Massmediah Version)
14.Shout Out (Remix) (Feat. DJ Tukutz)


Year Award-Giving Body Category Work Result
2001 Mnet Asian Music Awards Best Hip-hop Performance "Real"[5] Nominated