Add it to your server
In your server's .ini file (servertest.ini by default), add these to the existing WorkshopItems= and Mods= lines, separated by a semicolon (;).
WorkshopItems=3739256725;3828896676
Mods=NewMusic;456543
These lines include the mod it requires, as its Steam page declares it:
- New Music [42+] ·
NewMusic
| Workshop item | Subscribers | Declared in |
|---|---|---|
| New Music - Green day [B42]3828896676 | 8 | description footer |