Conversation so far:
When was Sam Cooke born?
01/22/1931
Did Sam Cooke have any siblings?
Sam Cooke was the fifth of eight children.
Where did Sam Cooke go to college?
How did Sam Cooke get his career started?
Sam Cooke began his career with his siblings in a group called the Singing Children when he was six years old.
Did Sam Cooke join any other groups besides the Singing Children?
Sam Cooke first became known as lead singer with the Highway QC's when he was a teenager, having joined the group at the age of 14.

Question: Who did he sign with?
Self-contained rewrite: Who did Sam Cooke sign with?