Robert Schumann’s teenage ambitions of virtuosity were undone by the onset of debilitating pain in his right hand ... gap between the notes – their ability plateaued. Then, they came into the ...

While his right hand sang like a bird, his grunting or murmuring left hand went its own way. Earlier jazz pianists played busy bass patterns that drove the music's rhythm. Think of boogie-woogie.

While there is some piano music composed for the right hand alone, the catalogue is much smaller, with no-one appearing to have advocated as strongly for the repertoire as Wittgenstein.