with dementia who composed a piano piece, using just four notes. let's remind ourselves of that moment. i will give you some random notes. and see what you can do with them. if natural. two f natural, a, b, t natural, there are your four notes. —— letter d natural. a beautiful piece of music. four notes went on to enter the charts and inspired a £1 million charity donation. the 81 year old recently travelled to manchester to conduct the bbc philharmonic orchestra fulfilling a lifelong ambition.