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The actual music of Ultima Underworld 1 + 2 (and maybe other former/old dos games) is poor, even below the quality of the first Soun Blaster cards. This could for example depend on the audio configuration for the dosbox emulation using midi playback. But midi playback depends on the used soundfont databank behind it. When you listened to midi playback of a Sound Blaster AWE32 or a Roland Keyboard of the same time you surely get a feeling for what I mean.
The conclusion?
Please GOG update the midi files, if used, to better ones (these e.g. come with the drivers and software of soundcards, keyboards or are available as open source sound fonts).
Or please use higher quality sound cards settings for dosbox emulation (when knowing that specific old soundcards had specific irq, dma, etc. channels they worked best or even only with, the game specific configuration should not be to difficult)