The music which the game plays is 100% coded into the client, and to a lesser extent, the zone files themselves. As the years went on many of the songs got "dropped" from the client - whether by accident or on purpose no one will know, but they are no longer there. A few examples of these songs are the extra combat themes and the underwater theme like you mentioned. Another one which i've noticed is missing is the bard themes that would normally play when a bard equips a lute/drum/horn or other instrument and plays a song.
Unfortunately there is no way to get these back because its up to the client and not the server to decide when these songs should play. Since the client is not changeable, there is no way to fix this.
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