Question: What is the name of the American hip hop singer, rapper, actress, songwriter and producer of this American girl group formed in Atlanta, Georgia in 1990, who contributed to the outfit and stage designs and received a lot of song-writing credits?
Sentence (from "Stypes"): Originally formed as a two-piece Hardcore Hip Hop duo, Adam Mason, "StereoAdam" and Aaron Curran, "StereoAaron" appeared on many stages in the Chicago underground scene.
Relevant evidence: No