The collection consists of 9 boxes of printed music and documents and 231 sound recordings (132 7” reels, 6 5” reels, 17 10” reels, and 76 cassettes.) The notated music consists of original music and arrangements by Gordon Jenkins and a small amount of music by Gordon Jenkins, Jr., including a handful of published choral octavos of arrangements of popular songs. Highlights of the collection include the complete music to the 1959 concept album by Judy Garland The Letter, the complete music to the Future section of the 1980 concept album Trilogy by Frank Sinatra and an arrangement of “Everything Happens to Me” made for Frank Sinatra.

From notations on the reels, they appear to contain recordings of Jenkins’s compositions, including potentially bootlegged copies of commercial recordings he worked on. The cassettes contain recordings of the compositions and arrangements of the composer Mort Stevens.