This mods adds music from the Ultrakill OST when you take out the apparatus. Specifically, this is the escape sequence music that you hear in level 7-4. This mod is designed specifically with the FacilityMeltdown mod in mind -- you can use it separately, but I wouldn't recommend it.
Make sure to set the music volume in the FacilityMeltdown config to 0, otherwise you will hear both the Ultrakill music and the default music from the Meltdown mod simultaneously.
Additionally, I recommend changing the master volume in the PizzaTowerEscapeMusic config to 0.35, as the track is pretty loud otherwise.
Hakita (Heaven Pierce Her) - War Without Reason (ULTRAKILL 7-4 Theme)
If you run into any issues, feel free to contact me on discord, just join the modding Discord and ping me over there or just DM me (nickname: futuresavior).