In September of this year, the minimalist composer Terry Riley, now aged 81, performed his legendary composition of 1964, 'In C' at London's Barbican Centre. 'In C' can be performed by any number of musicians playing any sort of instrument or even singing. In this case there was roughly a 60 year age gap amongst the 19 musicians playing everything from a viol da gamba to an electric guitar, who all devoted themselves intensely to a composition which involves executing 53 disp