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If you have The First Decade then you definitely don't need it. If you have the Covert Operations, you can just copy "scores.mix" from the Covert Operations CD to your game directory to get the same effect. If you have neither of those, then yes, it's advised to download the pack, since it will add a vast amount of music and remixes which were made for the game but were never enabled before.
http://nyerguds.arsaneus-design.com/cnc95upd/cc95p106/
