in version 1.0 you could pick up radio stations around Maykop. there are instructions on what frequency you need to tune in the KA-50 flight manual, (although I forget what page, I believe it is at the bottom of the page). That's where I found it. There were about 5 or more songs that would play, all in Russian. Kinda of neat! Also, you could put .ogg audio files in a audio folder in the game directory and you could listen to them instead, (According to the manual), although I never got this to work properly myself. they just wouldn't play for me.
This functionality was removed in v 1.02, although I don't know why. Does anyone know ??