Never before was it possible for not only single songs but also single recordings of songs to be so widely distributed to the population. Radios made the amount of veiwers to a single performance (a recording or broadcast production) become so much higher then before.
"Lili Marlene" was probably the most popular song of World War II with both German and British forces. This song was based on a German poem, this song was recorded in both English and German versions. The poem was set to music in 1938 and was a hit with troops in the Africa Korps. The song become so popular they decided to translate it to English.