Bach's arrangements of concertos for two pianos, adapted for four hands, showcase his mastery of contrapuntal writing and keyboard texture. These works are musically distinctive for their complex interweaving of melodic lines and their brilliant display of fugal techniques.
Requires exceptional independence of hands and precise control over voicing to bring out the contrapuntal lines.
Bearbeitungen von Konzerten für 2 Pianoforte zu 4 Händen 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 10.
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.
Bearbeitungen von Konzerten für 2 Pianoforte zu 4 Händen is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.