Since the
old instruments thread is dead, I thought I'd start a new one with a more modest request.
Basically, an acoustic guitar that functions like a portable music brick. With the guitar equipped, you would type /playsong to pick what you want to play from a dialogue like the music bricks settings, then hold primary fire. By default, "none" would be selected. With no music selected, no sound plays, but you animate anyway as if you're playing. Aditionally, the instrument would emit a music note particle effect.
As usual, I have zero modeling/scripting ability, so I can't really contribute myself outside of maybe making some acoustic guitar loops to specifically suit this add-on. If this alone gets done, it could open the way for more instrument add-ons with similar function.