Name of the artist here should actually be "Grandmaster & Melle Mel". This unique wording was the result of an ugly legal suit between Melle Mel (Melvin Glover) and Grandmaster Flash (Joseph Saddler). When Flash was essentially pushed out of his own group - especially in the fact that he was a non-player on the breakthrough Grandmaster Flash & Furious 5 track "The Message" - Melle Mel (with the encouragement of Sugarhill Records label head Sylvia Robinson) decided that he would take Flash's place in the band - and essentially take his name as well. During this time, the definitive singles "The Message II" and "New York, New York" were released under the name of Grandmaster Flash & The Furious 5, even though Flash had nothing to do with these releases.
The net result of the lawsuit forced Sugar Hill and Melle Mel to cease the theft of Flash's name - which resulted in the White Lines singles all being pressed with the name "Grandmaster & Melle Mel", with Melle Mel's name in larger type than "Grandmaster".
White Lines eventually proved to be Sugar Hill's downfall, as the famous bassline and much of other components of the song were stolen from the sub-underground (but now much more justifiably well known) track "Cavern" by Liquid Liquid, which resulted in another lawsuit - of which Sugarhill would never recover from.
Subsequent releases from Mel were released as Grandmaster Melle Mel.
Mel later dropped the "Grandmaster" & reunited with Flash in the late 80's - and toured with the reunited Grandmaster Flash & The Furious 5 in the early 90's.