Originally, this was going to bring back Unused music from the files, but I decided to rework by adding More flavours, yes it does bring back old/unused music back but also adding in 3 from EZ1 and 1 from EZ2.
Only 12 Songs are replaced:
Kill Bound is replaced with We Need Backup (EZ1)
Abandoned Place is replaced with Choices (EZ1)
Damaging Surroundings is replaced with BEC's Theme Extended (Unused)
Questionable Life Choices is replaced with What The Hell? (Unused)
Placement is replaced with The Project (EZ2)
Distant Light is replaced with BEC/Crawl Yard's stinger (Unused)
Combine Zombies is replaced with Weapon Jam (Unused)
Metal Scraps is replaced with it's old version
They Watch Our Every Move is replaced with Out Of Time (EZ1 Unused)
Ambrosia Short is replaced with it's full version
Farside is replaced with Victor's Motif in Piano (Unused)
Farewell is replaced with Triage At Noon (Unused)
Composers for these songs I think are: Employee 8, CW3D and Spencer Baggett