Program for a Hungarian National Association concert at the Vigado Concert Hall, Budapest, on April 28, 1937, two pages, 5.75 x 9, signed inside in fountain pen by both Bartok and Kodaly. Two horizontal folds, punch holes to left edge, and small areas of toned tape remnants at the top, otherwise fine condition. Two of the greatest Hungarian musical figures of their time, Bartok and Kodaly were close friends and collaborators, primarily in the study and composition of Hungarian folk music. A highly desirable and uncommon combination. RR Auction COA.