Conversation so far:
What happened during Billie Holiday's life in 1929?
By early 1929, Billie Holiday had joined her mother in Harlem. Their landlady was a sharply-dressed woman named Florence Williams, who ran a brothel at 151 West 140th Street.
What else did Billie Holiday and her mother do in Harlem?
Billie Holiday's mother became a prostitute, and within a matter of days of arriving in New York, Holiday, not yet 14, became a victim of sexual trafficking at $5 a client.
What music did Billie Holiday produce?
Eleanora Fagan (April 7, 1915 – July 17, 1959), better known as Billie Holiday, was an African American jazz singer with a career spanning nearly thirty years.
What songs did Billie Holiday record?
Billie Holiday recorded two songs: Your Mother's Son-in-Law and Riffin' the Scotch, the latter being her first hit.

Question: How many copies did the other two sell?
Self-contained rewrite: How many copies did the two songs by Billie Holiday sell?