Are there any good exercises for piano polyrhythm playing (5:7, 4:3, 25:35 etc.) beyond Brahms exercises and Chopin music? What you can recommend for technique improvements in little time?
closed as off-topic by Dom♦ Jun 28 '17 at 17:33
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Try Scriabin's etude Op. 8 no. 4 (Score: http://imslp.org/wiki/12_Etudes,Op.8%28Scriabin,_Aleksandr%29). And there are lots more Scriabin works which offer this kind of practice.
One idea for practicing these: try exaggerating the metrical accent points, possibly with some added arm lift and drop (dropping on the strong beat points). The idea is to "chunk" the playing of each hand's rhythm into the larger common unit, focus on that rather than on controlling the timing of each note as an individual unit. Just make sure the notes are even, and otherwise let them fall wherever they fall (as long as the strong beat points are accurate).
The American composer Edward MacDowell offers some very simple ones to get started. (Sounds like you are more than just started, but my tip might be useful to others who read the forum.)
If you're looking just at music that feature polyrhythms, you can probably look into minimalism. Most of these composers (john adams, steve reich, philip glass...) wrote at least a piano piece featuring polyrhythm.
You can try Scriabin Etude Op. 42 No.5, No.7, and No. 8. The second is filled with 3 against 4 polyrhythms and some 3 against 5, while the third is filled with 3 against 5.
My usual approach in a case like this is to make up my own exercise--e.g. find a bar of Chopin that exhibits the problem, maybe tweak it a little so it repeats easily, then play it through multiple tempos and keys. Or make it simpler or more complicated as necessary to get the right level of challenge.
You might want to have a look at https://www.reddit.com/r/piano/comments/1z3td5/looking_for_pieces_with_effective_use_of/ There you can find some further suggestions, for example the Saint-Saens Etude op. 52/4 and the Arabeske No.1 by Debussy are perhaps interesting for you.
Apart from these, Rachmaninoff Prelude op. 23/4 and op. 32/1 as well as some of his Etudes-Tableaux do have a lot of 3vs2 rhythms, but they look difficult on other aspects as well... Depending on your will to endure some pain you might be able to do some exercise with these pieces ;-)