[RichardHed]

Inflight Music and Randomizer (IMR) allows you to randomize play order of music and to change music to various nationalities without the need to leave the mission.
IMR setup comes with USA WW2 music, additional nationality expansion packs are available.

http://mission4today.com/index.php?name=Downloads&c=570

And don't forget the add-on packs
IMR Expansion Pack - Britain
IMR Expansion Pack - German
IMR Expansion Pack - Italian
IMR Expansion Pack - Japanese
IMR Expansion Pack - Polish
IMR Expansion Pack - Russian