Languages. Being able to communicate with more people, thereby go to more places, would be a dream.
Being a professional, "concert level" musician for every instrument, I would hope so.Like, just technique? Or does it include knowing music theory too?
Yup.Language. Are you kidding me? This would open up so many doors in life.
I'll hire a translator from all the money I make playing music.
Language prob more useful. You can translate anything and go anywhere.
Instruments is the only anwser here, unless you dont have a soul.