Mason Durell Betha, known professionally as Mase, is an American rapper. Best known for his work with Sean "Puff Daddy" Combs's Bad Boy Records, he signed with the label in 1996 and quickly found mainstream recognition as Combs's hype man. He guest appeared on Combs's 1997 single "Can't Nobody Hold Me Down", which peaked atop the Billboard Hot 100, while his first two singles as a lead artist, "Feel So Good" and "What You Want", both peaked in the chart's top ten. Released in October of that year, his debut studio album, Harlem World (1997), peaked atop the Billboard 200 chart, received quadruple platinum RIAA certification from the Recording Industry Association of America (RIAA), and spawned his third top-ten single as a lead artist, "Lookin' at Me". His guest performances on labelmate the Notorious B.I.G.'s single "Mo Money Mo Problems" and Combs's "Been Around the World" peaked at numbers one and two on the Billboard Hot 100, respectively, that same year.