If you are only hearing the Pizza tower music, make sure that 'ArdieMeltdown' is listed under 'Scripts' in the 'bgn.pizzatowerescapemusic.cfg' file. This is located in the Config editor of the mod manager.
This is a pair of songs I originally made for a modpack, but have now re-released them as a standalone mod. They are meant to be played after taking out the apparatus and during a Facilty Meltdown
Each song plays depending on if you are in or out of the facility and seamlessly transitions into each other when going into or out of the facility.
Preview of music (has since been remixed but it is still pretty accurate to what you will hear): YouTube Link
The songs are synced with the explosion that occurs if you can't make it back to the ship, so try not to vibe for too long.
HIGHLY RECOMMENDED WITH THE LETHAL RESONANCE MELTDOWN MOD as it is very good.
This mod avoids adding a preset config file to prevent overwriting your pizzatowerescapemusic and Facility Meltdown settings. So Facility Meltdown will need its configuration tweaked to remove its music on a fresh install of the mod.