Full Frequency Range Recordings

What does the sound of a 1943 German submarine have to do with the sound of a recording of Stravinsky's ballet Petrouchka released in England in 1947? However unlikely, there is a connection, and the connection is the phrase "Full Frequency Range Recording," coined by the British Decca recording company in the mid 1940s. We'll hear more about that  submarine and also Petrouchka and the sound of other early FFRR recordings.