Recording of Hugh le Caine's Ninety nine Generators. The title refers to the 99 organ sound generators sensitive keys - a separate generator for each note of the keyboard that can all be operated simultaneously. Le Caine here uses a resonance pedal and a device that can change the pitch to produce a vibrato or long glissandi impossible to achieve on an organ. The particular reverb of this piece is caused by the unusual acoustics of the place where it was realized.

Recording of Bor Turel's Sonotranjosti.

The entire program for the jazz hour (second hour) of Music USA, aired on November 23, 1956. This program features Hungarian jazz musicians who sent a recording to Conover shortly before the Hungarian Uprising of 1956; this hour was apparently was quickly assembled to replace the original program #695-B which had been recorded in October, but set aside for this replacement. The musicians remain unnamed, presumably for their safety, as Conover notes that it is unknown whether the musicians in the recording were still alive. Gerry Mulligan, Tony Scott, Quincy Jones, J.J. Johnson, and Billy Taylor comment on the musical selections.

The first part of Willis Conover's extended interview with W.C. Handy. This recording is the raw audio, and includes a glitch in the tape in the opening seconds, and other preliminaries before the interview begins.

Interview with Nat "King" Cole by a Voice of America interviewer identified as Walter. The mention of Cole's NBC television show narrows the possible date range to 1956 or 1957.

Willis Conover interviews entertainer Danny Kaye, who was serving as an ambassador-at-large for the United Nations Children's Emergency Fund (UNICEF).

The entire program for the jazz hour (second hour) of Music USA, including tune selections and an interview with Bob Shad, director of artists and repertoire (A&R) at Mercury Records, broadcast March 7, 1956.

The interview which accompanied Music USA #551-B, broadcast July 2, 1956, featuring Marshall Brown, John LaPorta, and four Farmingdale (New York) High School students.

One of two reels of music from Trinidad found in Willis Conover's collection. The artists and recording date have not been determined.

An unedited program, without theme music or a program number, but likely intended for the first hour of Music USA, including an interview with Andy Wiswell, director of artists and repertoire (A&R) at Capitol Records.

The music of Danny Kaye is featured in a program apparently broadcast by the Voice of America's Yugoslav Service.

The entire program for the jazz hour (second hour) of Music USA, including tune selections and an interview with Eddie Condon.

The fourth of five hours of Louis Armstrong talking at length about his life and career. In this hour, Armstrong discusses playing the trumpet, his health, and race relations, with musical selections interspersed.

The third of five hours of Louis Armstrong talking at length about his life and career. In this hour, Armstrong discusses his favorite musicians, with musical selections interspersed.

The fifth of five hours of Louis Armstrong talking at length about his life and career, with musical selections interspersed.

The entire program for the jazz hour (second hour) of Music USA, broadcast September 10, 1956.

The entire program for the first hour of Music USA, broadcast on January 17, 1957, and rebroadcast as #826-A on April 3, 1957.

The entire program for the first hour of Music USA, broadcast on July 10, 1956, and rebroadcast as #831-A on April 8, 1957. On internal documents, Conover had rated the program "AA," indicating that it was one he was particularly pleased with.

The second part of Willis Conover's extended interview with W.C. Handy.

Willis Conover interviews Billy Eckstine and Teddi King at Washington, D.C.'s Union Station, on the RCA Victor Starliner train. Eckstine and King were performing to benefit the March of Dimes; the interviews were apparently used in Music USA programs #420-B (Eckstine) and #421-B (King).

Recording of John Gilliland interviewing Tony Bennett in Fort Worth, Texas. Gilliland later used this recording in the Pop Chronicles radio program series.

Willis Conover interviews June Christy, Nat "King" Cole, Ted Heath, and Bob Flanigan backstage at a performance at the National Guard Armory in Washington, D.C. The interview with Nat "King" Cole was likely used in Music USA program #520-B.

The second of five hours of Louis Armstrong talking at length about his life and career. In this hour, Armstrong discusses the Hot Five and scat singing, interspersed with musical selections.

The first of five hours of Louis Armstrong talking at length about his life and career. In this hour, Armstrong discusses his early life and career, interspersed with musical selections.