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swing, in music, both the rhythmic impetus of jazz music and a specific jazz idiom prominent between about 1935 and the mid-1940s—years sometimes called the swing era. Swing music has a compelling momentum that results from musicians’ attacks and accenting in relation to fixed beats. Swing rhythms defy any narrower definition, and the music has never been notated exactly. Swing is sometimes considered a partial dilution of the jazz tradition because it organized musicians into...