Conversation so far:
What genre of music did Herb Jeffries make?
Herb Jeffries made Jazz and popular music.
Could you name the title of one of Herb Jeffries' songs?
Herb Jeffries' recording of Flamingo in 1940 with Duke Ellington sold more than 14 million copies in its day.
Did Herb Jeffries have any other hits besides Flamingo?
In 1945, Herb Jeffries had a hit on the Billboard R&B chart with Left A Good Deal In Mobile (No. 2).
What was the name of one of Herb Jeffries' albums?
Say It Isn't So.
How did the album Say It Isn't So sell?
Herb Jeffries record the 1957 collection of ballads, Say It Isn't So.
What else happened with Herb Jeffries' music career after recording Flamingo, Left A Good Deal In Moblie, and the album Say It Isn't So?
Herb Jeffries moved to Europe and performed there for many years, including at nightclubs he owned.
Are there any other interesting aspects about the Herb Jeffries' article?
From Detroit, at the urging of Louis Armstrong, Herb Jeffries moved to Chicago where he performed in various clubs, one of them allegedly owned by Al Capone.
Did anyone else notice Herb Jeffries' work besides Louis Armstrong?
On the advice of Billy Strayhorn, Herb Jeffries lowered his range to mimic the stylings of Bing Crosby and became a silken, lusty baritone according to music critic Jonny Whiteside.

Question: What did he say
Self-contained rewrite: What did Herb Whiteside say about Johny Jeffries?