Only just found out he died in June this year. An extremely talented musician and his influence far outweighs his popularity. A sad loss.

The "fifth" Beatle, the only person ever credited on Beatles songs (keyboards on Let It Be for example) apart from the other four, keyboardist with the Rolling Stones and many others as well as writing some of the most recognisable music today. (Bass line on the Stones "Miss You", wrote "You are so beautiful" for Joe Cocker)

http://news.bbc.co.uk/1/hi/entertainment/5054074.stm