skyjake wrote: »
I suppose the simplest way is described here: https://manual.dengine.net/modding/overview_of_resources_doomsday_1.x
You name the music files so they match the original music lump names, and copy them into the directory "data/doom2/music/" (or "doom1-ultimate", etc., depending on which game the music is for).
The location of this directory depends on your operating system. On Windows for example it should be under Program Files or wherever you installed Doomsday.