How many of Duke Ellington's compositions were copyrighted?

Answer 1

Edward Kennedy “Duke” Ellington was an African American jazz composer, pianist, and band leader who has been one of the most influential figures in jazz, if not in all American music.
Ellington was one of the twentieth century's best-known African-American celebrities. He recorded for many American record companies, and appeared in several films. Ellington and his orchestra toured the United States and Europe regularly before and after World War II. Many of his compositions were copyrighted but I can't give you an exact number.

MAJOR COMPOSITIONS
"C Jam Blues" (a 12-bar blues)
"I Got It Bad (And That Ain't Good)" (with Paul Webster)
"Cotton Tail" (written for Ben Webster)
"Creole Love Call"
"Do Nothing 'Til You Hear From Me"
"I Got It Bad (And That Ain't Good)" (with Paul Webster)
"I Let a Song Go Out Of My Heart" (with Irving Mills, Henry Nemo, John Redmond)
"I'm Beginning To See The Light"
"In A Mellotone"
"It Don't Mean A Thing (If It Ain't Got That Swing)"
"Mood Indigo" (with clarinetist Barney Bigard and manager Irving Mills)
"Prelude To A Kiss" (with Irving Mills)
"Sophisticated Lady" (with Irving Mills and Mitchell Parish)
"Satin Doll" (with Billy Strayhorn and Johnny Mercer)
"(In My) Solitude"

COMPOSITIONS ASSOCIATED WITH DUKE ELLINGTON
"Caravan", by Juan Tizol, an example of the Spanish Tinge
"Take the 'A' Train", by Billy Strayhorn. The "A" Train of the New York City subway goes to Harlem
"Things Ain't What They Used To Be", by Mercer Ellington, a rocking 12-bar blues

A PARTIAL DISCOGRAPHY
Masterpieces By Ellington (1950)
Ellington at Newport-Complete (1999; expansion and restoration of the complete 1956 Newport Jazz Festival performance)
Such Sweet Thunder (1957)
Ella Fitzgerald Sings the Duke Ellington Songbook (1957)
Ellington indigos (1958)
Newport Jazz Festival (1958)
Festival Session (1959)
Blues in Orbit (1959)
Anatomy of a Murder (Soundtrack album) (1959)
Duke Ellington and Johnny Hodges: Back to Back (1959)
Duke Ellington and Johnny Hodges: Side by Side (1959)
Piano in the Foreground (1961)
Louis Armstrong & Duke Ellington (1961)
Duke Ellington & John Coltrane (1962)
Duke Ellington meets Coleman Hawkins (1962)
Money Jungle (1962)
Afro-Bossa (1962)
The Great Paris Concert (1963, released 1973)
A Morning in Paris (1963, released 1996)
Ella at Duke's Place (1965)
The Symphonic Ellington (1965; 1985 reissue)
Ella and Duke at the Cote D'Azur (1966)
The Far East Suite (1966)
...And His Mother Called Him Bill (1967)
Francis A. & Edward K. (1968)
Latin American Suite (1968)
70th Birthday Concert (1969)
New Orleans Suite (1970)
The Afro-Eurasian Eclipse (1971)
Yale Concert (1968, issued 1973)
Live at the Whitney (1972, issued 1995)
Duke's Big 4 (1973)
Duke Ellington's Incidental Music for Shakespeare's Play Timon of Athens adapted by Stanley Silverman (1993). Ellington does not perform on this recording, but it includes previously unreleased compositions.
Take the 'A' Train

Answer 2

Hard to know for sure, but Duke was an ASCAP composer and he has 905 titles on their database. They would have to be copyrighted for ASCAP to collect performance royalties.