As a musician, Harper is known for his distinctive, sophisticated fingerstyle playing and lengthy, complex compositions. He has released a large catalogue of albums as an artist, most of which are available on his own record label Science Friction.
His career and influence have been respected by many musicians including; Jimmy Page and Robert Plant, both members of the 1970s band Led Zeppelin, Pete Townsend of The Who, Kate Bush, Ian Anderson of Jethro Tull, Pink Floyd, and more recently Californian harpist Joanna Newsom. Harper is also known for his guest lead vocals on Pink Floyd's song "Have a Cigar".
Harper has been referred to as "the longest running underground act in the world".
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