Hello Aternos Team,
Can you please add the Mod "Music Maker Mod"?
Link to the mod: https://www.curseforge.com/minecraft/mc-mods/music-maker-mod
This new and young mod allows players on latest minecraft versions (1.14 and 1.13) to play music in-game with real instruments and together as a band. It also adds several interesting redstone functionality to the game.