Nevermind, I found a solution. Using the command "music music/t1_fatal/tunnels_explore" I was able to get a singular track to play uninterrupted throughout the level.
I opened the BSP file with Notepad ++. The particular map I want to edit is t1_fatal, but there is no music setting listed in that file, only soundsets.
I want to replace the music of a singleplayer level with just one track. Unfortunately, the game requires you to make separate dynamic music tracks for exploration, action, etc. Is there any workaround for this?