Schräge Musik
Schräge Musik (German pronunciation: [ˈʃʁɛːgə muˈziːk]) was a common name for the fitting of an upward-firing autocannon or machine gun, to an interceptor aircraft, such as a night fighter. The term was introduced by the Luftwaffe during World War II. "Schräge Musik" was previously a German colloquialism, meaning music that featured an unusual tuning and/or time signature (e.g., jazz).