[ They start walking down the riverside road; the sun's not too bright today, which suits Phantom well. ]

It would depend on the needs of the craftsman. Without the aid of dreamotion, a piano would require months to produce by hand. Of course, this world has its own ways to speed up the process. I obtained the piano at the studio in exchange for holding a performance as well as taking charge of said studio... if you wish to trade any items for a piano, it would need to be exceedingly rare or useful.

[ Exchanging one's labour or a favour works too, but he's not so sure if he can imagine Eustace working for an instrument maker. ]