Music box + hamster wheel + Hungary = the Harry Potter Theme Song (Hedwig’s Theme), The Nutcracker, Hungarian Rhapsody No. 2, and three other songs.
Powered by walking and perfected with hand-punched holes in 8.5m (27.9ft) long strips of PVC, the Müpa Budapest Sound Machine was a temporary installation in Budapest’s Allee Shopping Mall, a celebration of the Müpa Concert Hall’s 2015 season. Able to play 30 notes, the contraption may also be one of the largest music boxes ever built.
This promo by Saatchi Hungary has a bit more: