Symphony no. 4, H 305

The Symphony No. 4, H. 305, by Bohuslav Martinů was composed in New York City from April 1945, and completed at Martinů's summer home at Cape Cod in June 1945. The finale bears the inscription South Orleans, 14th June, 1945.

The work is in four movements and, according to the composer, grows out of a single motif. The first movement alternates between lyrical and rhythmical material presented in variation. The second movement, in 68 time is a scherzo, marked by a rhythmically irregular Dvořákian leading melody. The slow third movement is dominated by the strings with short passagework for the woodwind. The finale is an energetic reworking of earlier material and concludes with a vibrant tutti.

The work is dedicated to his friends Helen and William Ziegler, and was premiered on 30 November 1945 at the Academy of Music in Philadelphia by the Philadelphia Orchestra under Eugene Ormandy.