Some 150 years apart, both composers developed minute nuclei into an ever expanding cosmos of sound, each against the background of his own era. Prick up your ears – Schubert's Fantasy in F minor and Sonata in B flat major D 617 crossed with Ligeti's Three pieces for two pianos: rich in contrasts, upsetting, and in a simply stunning interpretation by Andreas Grau & Götz Schumacher. In the beginning there was simply the idea of playing Schubert and Ligeti together in one program: "During the perf…