Seems that much like the gameplay itself.. people still can't make up their mind which has the best music!

But anyway.. I've really liked all the music in the games. I thought MTW had great music generally, though it was really the Islamic and Viking Invasion music that stood out. RTW was good too, though perhaps a bit more hit and miss than MTW. Some tracks on it were very bleh, but I others (such as the eastern track mentioned above) were very beautiful and moving. And in general the RTW atmospheric tracks were perfect. MTW was a very smooth soundtrack, with a few stand out tracks as well. All good stuff!

But when all is said and done, I'd have to go with Shogun for best music. Perhaps it's because the themes of Rome and Medieval Europe are fairly familiar to me, while Japan was something of a mystery. And the music set the scene of that mystery so well.