Grandmaster Flash had nothing to do with this song, but it was originally released under his name. Grandmaster Flash is a DJ, and in the early days of hip-hop, they were considered more important than the MCs who rapped over their beats. The band was known as Grandmaster Flash And The Furious Five, and it was Flash who assembled the group as a way to provide vocal entertainment for his DJ sets (note that his name comes first). While Flash was indisputably the star of their live shows, when the group started recording in 1979, the dynamic changed. Flash made his living revolutionizing the way existing songs could be manipulated, creating beats that flowed seamlessly together. He did this on the 1981 song "The Adventures of Grandmaster Flash on the Wheels of Steel
," but when it came to creating original songs, that was the specialty of the Sugar Hill Records house band and the group's lead rapper, Melle Mel.
The composer credits on "White Lines" belong to Melle (Melvin Glover) and Sugar Hill owner/producer Sylvia Robinson. By the time they put this song together, Grandmaster Flash And The Furious Five was fractured, and they broke up before it was released.
By this time, Melle Mel appropriated the name "Grandmaster," calling himself "Grandmaster Melle Mel." Flash and Mel went to court over the name, and in the end, this song is officially credited to "Grandmaster and Melle Mel."