Premise: Dr. Jeckyll & Mr. Hyde was an American 1980s hip-hop group consisting of Andre "Dr. Jeckyll" Harrell and Alonzo "Mr. Hyde" Brown. The group was known for its corporate business image, wearing designer suits and ties while they rapped. The group first performed under the name Harlem World Crew and recorded on Tayster and Rojac Records in 1980.
Hypothesis:  Rojac Records was in business in 1980.