Widor's "2 Duos" Op.52 are sophisticated studies in texture and harmonic development, showcasing his mastery of the keyboard. The pieces present intricate fugal passages and require considerable pianistic command.
The primary challenge lies in executing the dense contrapuntal writing with clarity and control.
2 Duos (Op.52) 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.52) lasts about 6.5 minutes.
2 Duos (Op.52) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.