Simplify the following text for a Grade 9 native English-speaking person.
Original: She scored a big hit with her first release , a coupling of `` Gulf Coast Blues '' and `` Downhearted Blues '' , which its composer Alberta Hunter had already turned into a hit on the Paramount label .
Simplified: Her first recording , a coupling of `` Gulf Coast Blues '' and `` Downhearted Blues , '' was very popular .