This afternoon and tomorrow evening in Symphony Hall, the third pair of concerts by the Boston Symphony Orchestra, Serge Koussevitzky conducting. The programme traverses a Concerto for Orchestra by P. E. Bach, Moussorgaky's Prelude to "Khoranochina", a Scherzo, "The Flight of the Bumble Bee" from "Tsar Saltan," Prokovier's Seythian Suite and Brahm's Fourth Symphony.

This evening in Jordan Hall a song recital by Tom Williams, baritone. His programme includes songs by Buononcini, Gretry, Rhene-Baton, Chausson, Richard Strauss, Griffes, Glazounov, and Gretchaninov.

Sunday afternoon in Symphony Hall a concert by the New York Philharmonic Orchestra conducted by William van Hoogstraten, brilliant conductor heard here to advantage last autumn in Tschaikovsky's "Pathetique" Symphony. The programme embraces Beethovea's Symphony No. 3 the "Erolea,"--Strausa's Salome's Dance and "Til Eulenspiegel," and Tschaikovsky's Second Piano Concerto with Yolanda Mero playing the solo part.

Sunday evening in the Copley-Plaza a concert by the Durrell String Quartet, well-known and much applauded in Boston, assisted by Mr. Lee Pattison, one of the best of Boston pianists. They will play Smetana's Quartet "Aus Meinen Lebont and Chausson's Quartet in A major for piano, violin, viola and 'cello.