Reger’s writing is characteristically dense, featuring intricate chromaticism and heavy textures that challenge the listener. This piece is distinguished by its complex harmonic progression and architectural scale.
Mastery of thick, layered textures and large harmonic stretches is required.
Comparable difficulty and character — good candidates for what to learn next.
Allegro in A major is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Allegro in A major lasts about 5 minutes.
Allegro in A major is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Albumblatt by Max Reger, Allegretto grazioso in A major by Max Reger, Allegretto grazioso for Piano by Max Reger — see the full similar-pieces list on this page.