Chopin wrote his op.46, Alkan his op.39 concerto, and now I 'discovered' Edouard Wolff (1816-1880, Warsaw-Paris, pupil of Elsner....) who wrote an 'Allegro de concert' op.39(!) dedicated to ' son ami F. Chopin', totally based on op.46 but 30 min. and in quite an accomplished form à la Liszt, I played it through a few times and am hooked, who else can find time to experience this piece and discuss it with me, it's on IMSLP.
Longtemps, je me suis couché de bonne heure, but not anymore!