Conversation so far:
In what year did Ahmet Ertegun get his start?
Financed by family dentist Dr. Vahdi Sabit, Ahmet Ertegun and Herb Abramson formed Atlantic Records in September 1947 in New York City.
What record label did Ahmet Ertegun and Herb Abramson start together?
Ahmet Ertegun and Herb Abramson formed Atlantic Records in September 1947 in New York City.

Question: Who was their first big artist?
Self-contained rewrite: Who was Atlantic Records' first big artist?