On August 1, 1942, the American Federation of Musicians, at the instigation of union president James Petrillo, started a strike against the major American recording companies because of disagreements over royalty payments. Beginning at midnight, July 31, no union musician could make commercial recordings for any record company. That meant that a union musician was allowed to participate on radio programs and other kinds of musical entertainment, but not in a recording session. The 1942–44 musicians' strike remains the longest strike in Hollywood history.
The strike did not affect musicians performing on live radio shows, in concerts, or, after October 27, 1943, on special recordings made by the record companies for V-Discs for distribution to the armed forces fighting World War II, because V–Discs were not available to the general public. However, the union did frequently threaten to withdraw musicians from the radio networks to punish individual network affiliates who were deemed “unfair” for violating the union's policy on recording network shows for repeat broadcasts.
Petrillo had long thought that recording companies should pay royalties. As head of the Chicago local chapter of the union in 1937 he had organized a strike there. He was elected president of the American Federation of Musicians in 1940. When he announced that the recording ban would start at midnight, July 31, 1942, most people thought it would not happen. America had just entered World War II on December 8, 1941, and most newspapers opposed the ban. By July it was clear that the ban would take place and record companies began to stockpile new recordings of their biggest names. In the first two weeks of July, these performers recorded new material: Tommy Dorsey, Bing Crosby, Charlie Barnet, Jimmy Dorsey, Guy Lombardo, and Glenn Miller, who made his last records as a civilian bandleader. Recording during the last week was a long list of performers, including Count Basie, Woody Herman, Alvino Ray, Johnny Long, Claude Thornhill, Judy Garland, Crosby (again), Glen Gray, Benny Goodman, Kay Kyser, Dinah Shore, Spike Jones, and Duke Ellington, among others.