Rosemondâ€™s company Czar Entertainment managed Gameâ€™s career, by helping to book tours, releasing DVDs and marketing the rapper.
At one point, Game was signed to Dr. Dreâ€™s Aftermath imprint, along with 50 Centâ€™s G-Unit imprint, all of which were being distributed by Interscope Records.
Federal authorities arrested Rosemond in June of 2011 after a month-long manhunt, and charged him with conspiracy to distribute cocaine.
During testimony this week, federal prosecutors introduced into evidence nine different Proffer Agreements, that contained admissions Rosemond allegedly made, in hopes of ultimately, obtaining a Cooperation Agreement with the government.
During a meeting on October 17, 2011, Rosemond allegedly detailed the method in which the cocaine gang shipped kilograms of the drug to the West Coast.
The crates were shipped to various rehearsal spaces in Los Angeles and intercepted by members of the drug operation.
According to Rosemond, they first did a test shipment, by sending a few pounds of marijuana to the West Coast.
And then, Rosemond allegedly told authorities that they took their test runs a step further.
IRS case agent Marc Van Driessche testified that Rosemond said the custom music crates were used in a test run, to send a shipment of firearms to Game.
Once the guns successfully arrived, the drug gang began shipping 5 to 10 kilograms of cocaine inside each individual music case.
Rosemond also admitted to investing money into various mailbox shops.
Rosemond and an associate named Lamont Bennett owned interests in a variety of stores in California during 2007-2009.
Testimony resumes on Tuesday.