No she ain't.
She had one huge record dassit.
Rapper's Delight
The Message
White Lines
^^^That's three huge records
Showdown
That's The Joint
8th Wonder
Freedom
Adventures Of Grandmaster Flash On The Wheels Of Steel
New York New York
Survival
Beat Street
Step Off
Half of the popular records from 79-84 came out on Sugarhill. The other half are from other labels.