Conversation so far:
When did Blind Lemon Jefferson begin with Paramount records?
Paramount became the leading recording company for the blues in the 1920s.
What was their significance for Jefferson?
Jefferson's earnings reputedly enabled him to buy a car and employ chauffeurs.
Did Jefferson sing for them?
Jefferson's "old-fashioned" sound and confident musicianship made it easy to market him.
Was he a hit with the public?
varying his riffs and rhythm and singing complex and expressive lyrics in a manner exceptional at the time for a "simple country blues singer..
Did he set any records?
"Matchbox Blues" had already become such a hit that Paramount re-recorded and released two new versions.
Did he have a spouse or family during this time?
CANNOTANSWER.
Is there anything else interesting I should know?
Jefferson was reputedly unhappy with his royalties (although Williams said that Jefferson had a bank account containing as much as $1500).

Question: Why was he unhappy?
Self-contained rewrite: Why was Blind Lemon Jefferson unhappy with his royalties?