Ian Patrick ` Mac ' McLagan ; ( 12 May 1945 -- 3 December 2014 ) was an English keyboard instrumentalist , best known as a member of the English rock bands Small Faces and Faces .
Ian Patrick ` Mac ' McLagan ; ( 12 May 1945 -- 3 December 2014 ) was an English keyboard instrumentalist . He was best known as a member of the English Rock bands Small Faces and Faces .