It does seem that pianists differ widely in their ability to maintain physical memory for the muscular feel and spacings in music; although this picture can be confused by the fact that some pianists do not like to admit to the amount of work they actually do. This amount of practice seems to depend on the pianist’s natural ability – including ability to practise antique piano mentally, physiognomy, co-ordination and training – and sometimes also, perhaps, on a superstitious fear of not practising. Shura Cherkassky apparently used to play scales and arpeggios in every key every day, while Barenboim, for example, is said to do remarkably little practice, technical or otherwise.