When I start the Game , Music and Sound play on the Menu Screen.
But when starting a new Campaign, there is no Sound and Music in the Game.
Anyone else with this problem here?

Happened to me too. Go to Options > Sound, and try all the different drivers until you find one it doesn't reject (the bottom two seem to work best for me).

No idea how long this'll last or if it'll keep reverting to 'no sound', but I've got sound for now. Fingers crossed.

I'd go with Direct Sound 3D software emulation. These are old games and any specific support for what would be considered ancient sound cards is probably a little shaky with modern hardware.

As others have stated, try the DirectSound3D Software Emulation (set by default) or the Miles Fast 2D Positional Audio drivers. One thing to note is that this may not fix it immediately for the save you're playing. Try starting a new mission to check if the music returns. I had this same issue after the game had set itself to no sound after I'd made other adjustments to my settings. Drove me nuts that none of the sound choices worked until I started a new mission and the music returned.

Flynn

Whoops wrong place.