Duplicate Custom background music for battles

[MeWhenI53]

We already have backgrounds for the main menu so why not custom music? Just upload an mp3 file and that will be the music for the battles you play instead of the default music that im pretty sure most of us heard enough times to want to change it.

 

[HoeenHero]

Closing as a duplicate of https://www.smogon.com/forums/threads/new-background-music.3651048/ and https://www.smogon.com/forums/threads/song-requests-during-battles.3671420/