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In page Ken Curtis:

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Curtis was a singer before moving into acting, and combined both careers once he entered films.[1] Curtis was with the Tommy Dorsey band in 1941, and succeeded Frank Sinatra as vocalist until Dick Haymes contractually replaced Sinatra in 1942. Curtis may have served simply as insurance against Sinatra's likely defection, and Dorsey was who suggested that Gates change his name to Ken Curtis. Curtis then joined Shep Fields and His New Music, an all-reeds band that dispensed with a brass section.[citation needed]