Version of Hexen: Deathkings of the Dark Citadel distributed by Steam has no music playing in levels. The music patch is available here here, but it requires running 16-bit EXE.
- contains only missing SNDINFO lump;
- made to be loaded with HEXDD.WAD version 1.0 to enable music in-game.
Probably having it as a WAD will save someone five minutes of installing and running DosBox.