Dear Mr. Beedle,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Motion Picture Films from G-2 Army Military Intelligence Division, 1918 - ca. 1947 in the National Archives Collection of Foreign Records Seized (Record Group 242) that contains 30 files related to Poland, 16 files related to Warsaw, and 6 files related to accordion playing that might be relevant to your research. The series Motion Picture Films of German News Newsreels and Newsreel Excerpts, 1942-1944 and Motion Picture Films Confiscated from Foreign Countries and Sources, 1940-1944 in Record Group 242 that includes 3 files related to Poland and 4 files related to Warsaw may be of interest. We also located the series Moving Images Related to Military Activities in the Records of the Office of the Chief Signal Officer (Record Group 111) that contains 27 references to accordion playing, including 1 file that describes a "tank crew member seated atop tank play[ing] accordion" in Czechoslovakia. The series Miscellaneous German Films, 1934?-1944? in Record Group 111, the series Moving Images Related to German Life and Military Activities, ca. 1930 - ca. 1945 in the W. Cliff Haller Collection (Collection Halle), and the series German Language Motion Picture Films, 1936-1949 in the William F. Rope Collection (Collection Rope) may contain some useful information as well. Some of these records have been digitized and may be viewed online using the Catalog. Please contact the National Archives at College Park - Motion Pictures (RDSM) at email@example.com for information about the non-digitized films and similar records.
Next, we located the series Photographs Taken by Propaganda Units of the German Armed Forces (Wehrmacht) and the Waffen-SS, 1939-1945 in Record Group 242 that includes 13 images related to Poland and 4 images related to Warsaw. The series Photographs Taken by German Army Propaganda Companies, ca. 1940 - ca. 1943 in Record Group 242 might be useful. We also located the series Photographs of the Allies and Axis, 1942-1945 in the Records of the Office of War Information (Record Group 208) that contains images of German activities during World War II. Some of these records have been digitized and may be viewed online via the Catalog. For assistance with the non-digitized photographs and similar records, please contact the National Archives at College Park - Still Pictures (RDSS) at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDSM and RDSS. We apologize for this inconvenience and appreciate your understanding and patience.
Finally, we suggest that you contact the Bundesarchiv (German Federal Archives) and the Naczelna Dyrekcja Archiwów Państwowych (Polish State Archives) for further assistance.
We hope this is helpful. Best of luck with your research!
Thank you so much for this!