|Ravel (left) and Lily Laskine (harpist) probably in the mid 1920s|
|Albert Blondel was director of Maison Érard in Paris|
|This is really a musical commercial for Maison Érard|
|Harp music for a pedal harp......egad, key of g-flat. - why g-flat?|
It's an interesting story and the clues will take you through it.