For those who don't know how to setup the mod, I did those steps and it worked.
1- Make sure the mod is enabled in your mods list
2- Once in the server, enter the castle
3- The soundtrack should reload and put Banjo-Kazooie's instead of SM64
You can disable and reanable the mod if it doesn't work the first time you launch the server.
The Banjo-Kazooie's music pack is amazing. 10/10
