I remember one occasion many years ago in the Park Lane office. I was whistling or humming a fairy obscure American R&B song from the mid 1950’s. At that moment the Boss (as we used to call him) happened to meet me in the corridor, and named both tune and singer. To say I was surprised is understatement , but then he explained that many years previously he used to be a drummer. So I discovered yet another facet of this remarkable man. 
Arthur