The Parnassius Piano Duo offers programmes of music performed on two pianos as well as concerts which draw on the piano duet repertoire.
Examples are Elgar’s Enigma Variations for Two Pianos (the composer’s own arrangement) and several transcriptions of symphonies for piano duet such as
Rachmaninoff: Symphony No.2 in E minor Op.27 (transcribed by Wladimir Wilschau)
Elgar: Symphony No.1 Op.55 (transcribed by Karg-Elert)
Beethoven: Symphony No.5 in C Op.67 (transcribed by Scharwenka)
Beethoven: Symphony No.3 in E flat Op.55 (transcribed by Franz’s brother, Ferdinand Schubert)
Please do look at their repertoire page to see the full list of piano duets and works for two pianos. The page also includes some example programmes.