First recorded by Edgar Hayes & His Orchestra (1938).
Based on “Tar Paper Stomp” by Wingy Manone (1930).
Hit versions by The Glenn Miller Orchestra (US #1 1939), Ernie Fields & His Orchestra (US #4/R&B #7/UK #14 1959), Ray Stevens (US #40/C&W #39/UK #31 1977).
From the wiki: “‘In The Mood’ was arranged by Joe Garland and Andy Razaf based on a pre-existing melody: The main theme previously appeared under the title of ‘Tar Paper Stomp’ credited to jazz trumpeter/bandleader Wingy Manone. Manone recorded ‘Tar Paper Stomp’ in 1930 but, because the song was not formally registered for copyright, meant that the melody could be appropriated by any musician with a good ear. A story says that after ‘In the Mood’ became a hit, Manone was paid by Miller and his record company not to contest the copyright.
The original recording of ‘In The Mood’ was made by Edgar Hayes & His Orchestra in 1938, with songwriter Garland participating. Popular thought is that the melody had already become popular with Harlem bands (e.g. at the Savoy Ballroom) before being written down by Garland. Before offering it to Glenn Miller, Garland sold the tune to Artie Shaw, who could not record it because the original arrangement was too long.