Total Annihilation Music Mod
What is the TA Music Mod
This mod changes the in game music to the Total Annihilation Soundtrack.
This is a UI mod so it works fine in multiplayer.
There are two versions of this mod, one for Supreme Commander and one for Forged Alliance. The version linked below is for Forged Alliance, you can download the Vanilla version from the link provided at the bottom of the page.
This thread on the GPGnet forums should have any additional information you may require.