Question: What was the founder of the Material World Charitable Foundation often referred to as?
Related documents: [0]  [DOC] The Material World Charitable Foundation (MWF) is a charitable organisation founded by English musician George Harrison in April 1973. Its launch coincided with the release of Harrison's album "Living in the Material World" and came about in reaction to the taxation issues that had hindered his 1971–72 aid project for refugees of the Bangladesh Liberation War. Harrison assigned his publishing royalties from nine of the eleven songs on "Living in the Material World", including the hit single "Give Me Love (Give Me Peace on Earth)", to the foundation, in perpetuity. [END] 
[1]  [DOC] George Harrison, {'1': ", '2': ", '3': ", '4': "} (25 February 1943 – 29 November 2001) was an English guitarist, singer-songwriter, and producer who achieved international fame as the lead guitarist of the Beatles. Often referred to as "the quiet Beatle", Harrison embraced Hinduism and helped broaden the horizons of his fellow bandmates as well as their American audience by incorporating Indian instrumentation in their music. Although most of the Beatles' songs were written by John Lennon and Paul McCartney, most Beatles albums from 1965 onwards contained at least two Harrison compositions. His songs for the group included "Taxman", "Within You Without You", "While My Guitar Gently Weeps", "Here Comes the Sun" and "Something", the last of which became the Beatles' second-most covered song. [END] 
Answer: 
the quiet Beatle
the quiet Beatle