Titles read: "Pathetone - presents - EARL CARROLL & HIS RADIO BAND".
London, probably Pathe Studio.
Various shots of Earl Carroll and his band playing a jaunty tune called 'Swing and Sway'. One of the musicians comes down to the microphone to sing the lyrics. Shots of people in evening dress dancing are intercut and superimposed.
(In the opinion of this cataloguer, this doesn't quite swing - it's a bit too British!)
Note: also known as Earl Carroll and His Radio Boys.