Lyrics:

W. Hirsch / Vaughn DeLeath / N. Cloutier / L. HandmanOnce they called it ragtimeAnd it had its flingIt's the same old syncopationNow they call it swingThen they played it jazz timeTo a buck-and-wingOnce again it sweeped the nationNow they call it swingWhen singers used to singThey would go hot chaBut with this modern thingNow they go dru-du du, dra-da-daRhythm has its seasonsSummer, fall and springBut for seven silly reasonsSomeone pulled the stringAnd they started dancingNow they call it swing

Billie Holiday Now They Call It Swing