I just noticed the Washington D.C. quarter has Duke Ellington on it.
As far as I know this is the first working musician to be shown on a US coin, although some of the other state quarters have musical references.
I say "working" since Thomas Jefferson allegedly played the violin.
Not the first black American on a US coin however. A commemorative half dollar was struck in 1946 to honor Booker T. Washington.
But I've never found a Booker T. Washington half dollar in my pocket change.
"Booker" is an unusual name, obviously from an age before people were afraid their children would ever learn anything.