Hey there, since the recent xbox update I no longer have any music in Forza 5 on any screen other than when racing.
I’ve checked the settings and the menu music is on but still nothing.
So after the race for example when the cameras wheel level and it slows to a stop, and when you get the race results and credits, it’s all silent.
Any ideas?
I have the same problem since last week.
Hard reset.
Don’t know why you complaining the Music in the game is dyer !! 
Same with me, the sound effects work, but no menu music…
Same with me, the sound effects work, but no menu music…
As Totlxtc has suggested, completely shutdown your console by holding the Xbox One power button (not the controller’s) until the console turns off; then, restart.