Make sure your MIDI drivers are installed and working. Use DXDIAG to check the Sound and Music sections. Under Music, tell us what it says about MIDI.
The default MA3 music is an SGT (segment) file, which is a stripped-down MIDI file. All the fancy proprietary stuff is removed, so it should be very simple for the DirectX drivers to play. The sound card doesn't even need any built-in sounds, since I provide them in the file. The Microsoft DirectMusic Producer tool saves its output as SGT files.
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