Hindenburg's aluminum piano.

For who is informed about Hindenburg's history, and how they had a strong politics of avoid heavy weight as possible, this can be interesting :

https://www.airships.net/blog/hindenburg-piano/

https://www.youtube.com/watch?v=rTHe_rOYTJA

"The piano was removed before the beginning of the 1937 season and taken to the Blüthner factory, where it was placed on display.  The piano was destroyed in 1943 when the factory burned following an air raid during the Second Word War."