I agree that GAK has the best intro music, but a Medieval hymn doesn't fit against the backdrop of 19th century factories at all! It must be my local Steam server, hope it's fixed soon...
Why do you need a mod? All you need to do is covert/rip your favorite track to a wav file and rename it as OpeningMenu_Exp2.wav
For PC users, move that wav audio file to the following location replacing the BNW opening menu music (backup the original OpeningMenu_Exp2.wav if you want bring it back later).
X:\..\Steam\steamapps\common\Sid Meier's Civilization V\Assets\DLC\Expansion2\Sounds\Streamed\Music\
In my case, OpeningMenu_Exp2.wav exists and is the correct file, but OpeningMenu_Exp.wav is still being used... I fixed it for now by renaming the GAK theme and copying the BNW theme to OpeningMenu_Exp.wav. Actually this is a larger issue, because the adviser level keeps reverting to "New to Gods and Kings" also. xDWhy do you need a mod? All you need to do is covert/rip your favorite track to a wav file and rename it as OpeningMenu_Exp2.wav
For PC users, move that wav audio file to the following location replacing the BNW opening menu music (backup the original OpeningMenu_Exp2.wav if you want bring it back later).
X:\..\Steam\steamapps\common\Sid Meier's Civilization V\Assets\DLC\Expansion2\Sounds\Streamed\Music\
How do you convert MP3s to WAVs?
Wow! It worked! Does replacing one of the game files prevent me from getting steam achievements
Problem persists, moderator please move to tech support.