I always found it strange that Act II's overworld zone had its soundtrack split between the general desert theme and the Canyon of the Magi theme. This mod addresses that by making them both the same song.
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In the zip file will be 2 folders, altmusicdesert1 and altmusicdesert2. The first one is a custom-edited 9 minute track that has all the sections from both songs seamlessly combined, and the second is an extra version I downloaded years ago, which is a 6 minute mix that features everything from the Canyon of the Magi theme but leaves out the last half of the general desert theme.
Chose only one of these as they will overwrite each other.