I don't know much about this guy. But from what I do know is that he was responsible for the release of 2Pac's Lost Tapes. Pre-Digital Underground material. Pac in his Stricly Dope Days (w/Ray Luv and DJ Dizzy).
Chopmaster was the co-founder of Digital Underground.
http://www.rapdict.org/Chopmaster_J
More info:
Back in 1991 the city of Oakland suffered one of the most devastating fires in the history of this country. Lots of lives and property were destroyed from what started out as a small fire from a burning coal. I recall that day vividly because Public Enemy was in town performing. I recall seeing a small fire in the Oakland Hills early that morning and figured that it would be put out in a relatively short period of time without much fan fare. Who would've thought in their wildest dreams that small fire that started because of a burning coal would become a raging inferno. There are very few people who in Oakland who don't know some one who was directly effected. I know several people who lost family members and at least 10 families who lost houses.
One of the casualties to that the Oakland fires was Digital Underground. Many within the group lived in an apartment complex that was completely devoured by the blaze. Shock G lost all his original music, old school tapes, art work and recording studio. DU co-founder Chopmaster J lost his house and recording studio. Among the items destroyed were the original 1989 recordings from a young brash brother named Tupac and his group Strictly Dope which included DJ Dizzy and Ray Luv. Chopmaster had recorded and produced much of Pac's earlier work and as far as he was concerned it perished in the inferno. Not too long ago Chopmaster came across a master reel that was stored in his mother's basement. To his surprise it was the original 2Pac recordings. Needless to say it was a treasure of a find.
Chopmaster after painstakingly cleaning up these 10+ year recording has released them on an album called 'The Lost Tapes'. Its 2Pac when he was 17 years old and just getting started in the rap game. Listening to him rhyme back then was incredible. The brother was talented, overtly political and slightly ahead of his time. Many of the beats had a definitive East Coast feel that was pervasive at the time while others reflected the early Oakland street sound. Tracks like 'Panther Power' and 'Let Knowledge Drop' show a young man trying to put forth his view point on social issues, while other tracks like 'The Case of the Misplaced Mic' pts 1 & 2 illustrate 2pac's willingness to to step to the mic and flex his skillz in an emcee battle. Other tracks like 'My Burning Heart' are precursors to his introverted, sensitive side. 'Minnie the Moocher' and 'A Day In the Life' demonstrate 2Pac's ability to tell stories and paint vivid pictures. It's a nice LP especially when you consider they are among his first recordings.
http://www.daveyd.com/fnvapril10live.html
Peace
T