Lovely and informative video about the Making of a Steinway Piano. This bit of background adds to the magic:
…Many parts of the process in building a Steinway have remained essentially unchanged for generations. So much so, that we were able to take decades-old audio from a narrated factory tour by the late John H. Steinway (great-grandson of Henry E. Steinway, who founded our great company in 1853) and use it as the narration for footage shot at the Steinway NY factory in 2011 by Ben Niles, producer of the documentary film "Note by Note."
(via The Kid Should See This)