Looking for co-op partners, just achievement hunting

I've referred back to a bunch of threads on the steam page, i understand the game can't support much modding besides cursors. But i was wondering, would it be possible to change out the music tracks at all? There's this song called all pigs must die and i keep chuckling at the idea of replacing the tracks with the songs instrumental, should this be possible? ...

The multiplayer doesn't work for me, I played last week, and now I'm just loading up in the form of meat bags that don't interact.

Bacon

so i was playing blood and bacon and i left the game to go the main menu and i see "go play some Team fortress" can someone explain this?