This is happening in Windows Vista.
When I try to play any quest and enter a DMap which is set to use SPC music, Zelda-w.exe immediately crashes and I see this error:
Assertion failed!Program: zelda-w.exe
file: zsys.cpp
line: 217Expression: low <=high
EDIT: This is also happening with IT music as well. As far as I can tell, this bug was introduced in build 795 and nobody noticed it until now.