Widor's "2 Duos" Op.40 continue his exploration of contrapuntal writing, offering challenging yet rewarding passages. The pieces are characterized by their complex textures and demanding interplay between the hands.
Cultivate an awareness of the inner voices and ensure each line is heard distinctly.
2 Duos (Op.40) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 2 Duos (Op.40) lasts about 7 minutes.
2 Duos (Op.40) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.