Question: Graham Hamilton portrayed Fagin in a musical based on a novel by which author ?

Context paragraphs:
Oliver!: Oliver!  is an English musical, with music and lyrics by Lionel Bart.  The musical is based upon the novel "Oliver Twist" by Charles Dickens.

John Graham Hamilton: Admiral Sir John Graham Hamilton (1910–1994) was a Royal Navy officer who went on to be Commander-in-Chief, Mediterranean Fleet.

Graham Windham: Graham Windham is a New York City-based nonprofit that provides services to children and families.  It was founded in 1806 by several prominent women, most notably Elizabeth Schuyler Hamilton (Eliza).  The organization has recently received greater awareness because of Lin-Manuel Miranda's hit Broadway musical "Hamilton" in which Eliza Hamilton, portrayed by Phillipa Soo in its original run, expresses that she is "proudest of" establishing "the first private orphanage in New York City."

Graham Macky: Graham Hamilton Macky (born 16 February 1954) is a long-distance runner from New Zealand, clocking his personal best of 2:14:36 in Beijing, 1986.  He won his first national title in the men's marathon in 1983, clocking 2:21:22 in Mosgiel, and won the Rotorua Marathon in 1991.

Graham Hamilton (swimmer): Graham Hamilton is an Australian former swimmer.  He competed in the men's 4 × 200 metre freestyle relay at the 1956 Summer Olympics.

Graham Lyle: Graham Hamilton Lyle (born 11 March 1944, Bellshill, Lanarkshire, Scotland) is a Scottish singer-songwriter, guitarist and producer.

Oliver Twist (1948 film): Oliver Twist is a 1948 British film and the second of David Lean's two film adaptations of Charles Dickens novels.  Following the success of his 1946 version of "Great Expectations", Lean re-assembled much of the same team for his adaptation of Dickens' 1838 novel, including producers Ronald Neame and Anthony Havelock-Allan, cinematographer Guy Green, designer John Bryan and editor Jack Harris.  Lean's then-wife, Kay Walsh, who had collaborated on the screenplay for "Great Expectations", played the role of Nancy.  John Howard Davies was cast as Oliver, while Alec Guinness portrayed Fagin.

Gallagher and Lyle: Gallagher and Lyle are a Scottish musical duo, comprising singer-songwriters Bernard Joseph "Benny" Gallagher (born 10 June 1945, Largs, Ayrshire) and Graham Hamilton Lyle (born 11 March 1944, Bellshill, Lanarkshire).  Their style consists mainly in pop, soft and folk rock oriented songs.

Graham Hamilton: Graham Hamilton (born 27 November 1944 in Leeds, West Yorkshire) is a British stage and television actor who was the 15th President of Equity, the actors' trade union, between 2008 and 2010.  Formerly Vice-President for ten years, Hamilton has been involved in Equity's ruling Council since 1973, during his acting career in plays and musicals in the West End.  He is known chiefly for his portrayal of Fagin in Oliver!  After working in the West End, he became famous for playing the villain in over twenty-one pantomimes, appearing at major theatres throughout the UK.  In 2007, he was awarded Honorary Life Membership of Equity by its governing Council for distinguished service to the union.

Deaf Side Story: Deaf Side Story is a musical based on "West Side Story", itself an adaptation of William Shakespeare's play "Romeo and Juliet".  Takes place in New York City during the mid-1950s, the musical based on West Side Story explores the rivalry between the two gangs Jets and the Sharks, two teenage street gangs of different cultural backgrounds (Deaf and Hearing).  The members of the Sharks from Puerto Rico are taunted by the Jets, a white working-class group.  The young protagonist, Tony, one of the Jets, falls in love with Maria, the sister of Bernardo, the leader of the Sharks.  The theme, music, and dances focus on culture problems.

Supporting paragraphs: Graham Hamilton Oliver!
Answer: Charles Dickens