REMOVE

1. Glass negatives
2. Music ensembles.
3. Musicians.
4. Photographs
5. Library of Congress Prints a …
6. 1937

WHAT

1. Glass negatives (1)
2. Music ensembles. (1)
3. negative (1)

WHO

1. Genthe, Arnold (1)
2. Library of Congress Print … (1)

WHEN

1. 1869-1942 (1)
2. 1942 (1)
3. between 1937 and 1942 (1)