Unknown Session is an album by American pianist, composer and bandleader Duke Ellington recorded in 1960 but not released on the Columbia label until 1979.

The Allmusic review by Scott Yanow awarded the album 4 stars and stated "these renditions are quite enjoyable, swing hard and sound fresh. Ellington fans should pick this one up".

:All compositions by Duke Ellington except as indicated

Edward Kennedy "Duke" Ellington (April 29, 1899 – May 24, 1974) was an American composer, pianist, and big-band leader. Ellington wrote over 1,000 compositions. In the opinion of Bob Blumenthal of The Boston Globe "In the century since his birth, there has been no greater composer, American or otherwise, than Edward Kennedy Ellington." A major figure in the history of jazz, Ellington's music stretched into various other genres, including blues, gospel, film scores, popular, and classical. His career spanned more than 50 years and included leading his orchestra, composing an inexhaustible songbook, scoring for movies, composing stage musicals, and world tours. Several of his instrumental works were adapted into songs that became standards. Due to his inventive use of the orchestra, or big band, and thanks to his eloquence and extraordinary charisma, he is generally considered to have elevated the perception of jazz to an art form on a par with other traditional genres of music. His reputation increased after his death and the Pulitzer Prize Board bestowed on him a special posthumous honor in 1999.

Luis Fernando Vager (born June 12, 1965), better known as "Little" Louie Vega, is an American musician of Puerto Rican ancestry. He is one half of the Masters At Work musical production team. He was born to a musician family, as his father, Luis Vager, was a jazz saxophonist, and his uncle was singer Héctor Lavoe of the Fania All-Stars, and he started his DJ career spinning records at the age of 13.

By 1985, Louie who is cousin to Eric Vega, popular event creator and promoter in New York City began playing house and block parties in his local Bronx neighborhood of New York, as well as engineering and mixing. (Erasure's The Two Ring Circus features his earliest dabblings in the studio.) His first nightclub residency was at the Devil's Nest, in the Bronx, and later he moved to Roseland, Studio 54 and the Palladium in Manhattan. During the 1990s, Vega was playing at one of the most influential nightclubs for house music, The Sound Factory Bar. By the mid 1990s, the Masters At Work team had Vega spending less time behind the turntables and more time in the studio as part of the team's remixers.