George Hamlin (1868-1923) was an American tenor. His daughter, Anna (1900-1988), was a soprano and voice instructor. The George and Anna Hamlin papers, dating from 1868 to 1983, document the careers of both vocalists through clippings, diaries, autograph books, programs, publicity materials, scores, photographs, and correspondence.

The collection contains recordings of fifty-one of the fifty-three concerts presented at the June in Buffalo festival from 1975-1978 and in 1980. Approximately 216 works were recorded as well as some spoken introductions to works by their respective composers. The collection also contains recordings of three of the five lecture-seminars presented by John Cage during June in Buffalo 1975.

The collection contains approximately 1300 scores, half of which bear markings entered by Mikhashoff or his colleagues in preparation for performance. The collection includes manuscripts and print publications, both originals and reproductions.