Andor Foldes, New York pianist, will present a concert of modern music at the Paine Music Building at 8:30 tonight in the first of two Department-sponsored programs this week. Sunday evening the California String Quartet will perform selections from Schubert, Barati, and Beethoven. Both concerts are open to the public and are free.

Tonight's selections include works by Aaron Copland, Leroy Robertson, Richard Franko Goldman, Roy Harris, Roger Sessions, Bela Bartok, and Zolton Kodaly. Also featured will be "improvisation," by Walter Piston '24, professor of Music, and Two Etudes by Virgil Thomson '22.

The California String Quartet will appear Sunday through the generosity of Mrs. Elizabeth Sprague Coolidge. The members of the group are Felix Khuner, violin; David Schneider, violin; Detlev Olshausen, viola, and George Barati, 'cello.

Shubert's String Quartet Opus 161, Beethoven's String Quartet in B flat, Opus 18, and a piece written by Barati in 1944 in honor of Mrs. Coolidge, will comprise the program Sunday.