credits to metrozero for providing the original base

To use these, just replace the .mp3s with your own.

The files are named in the following logic:

M - Menu 
MM - Main Menus
MME - Main Menu Extras

S_X_Name   Simulacrum, X Track Number, Name

SX_Y_Name   Stage X-Number, Y Track Number , Stage Name 
SXB_Y_Name  Stage X-Number Boss fight, Track Number, Stage Name

SE_Y_Name Stage Endgame, Track Number, Stage Name
SEB_Y_Name Stage Endgame Boss fight, Track Number, Stage Name

SF_Y_Name Stage Final, Track Number, Stage Name
SFB_Y_Name Stage Final Boss fight, Track Number, Stage Name

SHR_Y_Name Stage Hidden Realm, Track Number, Stage Name