Huh, i was thinking of Death Rally too! I even checked this topic yesterday, but i think i must've read over it. I've played the game again recently after listening to the soundtrack a lot, but i don't think the pause music is actually used in-game, right? I haven't heard it myself yet.
The menu music (menutune.s3m) also includes a loooooot of subsongs.
The intro music/boss battle music seemingly doesn't show up in the track1-track9 modules, but you can download that as purple_motion_-_death_rally_-_hard_metal.s3m. It's probably my favourite song in the game's soundtrack.
It too contains some pause music, like the other track songs.
CHIPPERS (wvl-abled-dino-fzmx_CHIPPERS.it) also contains a couple of hidden subsongs. We had a few extra patterns left, so we used those to create some extra songs. There was no space for them in the sequence though, and they're easter eggs after all.
So you'll have to manually add in the bonus song patterns to the sequence, if you want to give them a listen. You can find the songs by scrolling through the pattern list.