Question: Which English musician wrote the song about a world at peace that has a solo piano interpretation on Reimagining?

Context articles: Tragicomic (album)
Reimagining (album)
Eugeniusz Knapik
Circus Left Town
Imagine (John Lennon song)
55 Cadillac
Starr Parodi
Distant Memories
Concerto for Solo Piano (Alkan)
Kreisleriana

Tragicomic is an album by American jazz pianist Vijay Iyer, which was recorded in 2007 and released on the Sunnyside label.
 The follow-up to "Reimagining", the record features ten Iyer's compositions for his quartet with Rudresh Mahanthappa on alto sax, Stephan Crump on bass and Marcus Gilmore on drums, and two covers: a dub version of Bud Powell's "Comin' Up" and a solo piano interpretation of the standard "I'm All Smiles".
Reimagining is an album by American jazz pianist Vijay Iyer, which was recorded in 2004, originally released on the Savoy label and reissued in Europe by Pi Recordings.
 The follow-up to "Blood Sutra", the record features nine Iyer's compositions for his quartet with Rudresh Mahanthappa on alto sax, Stephan Crump on bass and Marcus Gilmore on drums, and a solo piano interpretation of John Lennon's "Imagine".
Eugeniusz Knapik (born July 9, 1951 in Ruda Śląska) is a Polish pianist and composer of classical music best known for his 1980 chamber piece String Quartet No. 1.
 Knapik studied composition and piano with Henryk Górecki (1933–2010) and Czesław Stańczyk at the University of Music in Katowice.
 Later, he studied composition under Olivier Messiaen in Paris under a French government scholarship.
 As a pianist he has recorded widely, specialising mainly in 20th-century music.
 He has won numerous prizes for his compositions, including at the Festival of Polish Piano Interpretation in Słupsk, and the International Chamber Music Competition in Vienna.
"Circus Left Town", also known as "Circus" is a ballad written by the British recording artist Eric Clapton.
 The rock musician wrote the song about the last night he spent with his then four-year-old son Conor.
 Although Clapton played and recorded the song for his 1992 million seller live album "Unplugged", he decided to release the title six years later as a re-recording for both his 1998 effort "Pilgrim" and as a single release.
 However, Clapton played the song live for his 1992 Eric Clapton World Tour, before it came out on any recording formats.
"Imagine" is a song written and performed by English musician John Lennon.
 The best-selling single of his solo career, its lyrics encourage the listener to imagine a world at peace without the barriers of borders or the divisions of religion and nationality, and to consider the possibility that the whole of humanity would live unattached to material possessions.
55 Cadillac is the fourth studio album by American musician Andrew W.K., released on September 7, 2009 through Ecstatic Peace!
 on vinyl format and W.K.'s own record label, Skyscraper Music Maker.
 "55 Cadillac" is an instrumental solo piano album featuring "new age" spontaneous solo piano improvisations and was recorded in Cleveland, Ohio.
Starr Parodi (born in Los Angeles, California) is an American composer, pianist, conductor, arranger, and music director.
 She has won multiple BMI most performed music awards, Key Art and Telly Awards.
 In May 2017 Starr's most recent album "The Heart Of Frida" a cinematic collection of solo piano works inspired by the late legendary artist Frida Kahlo, was awarded ZMR's "Piano Album Of The Year - Solo" by International Radio Broadcasters.
 Starr's solo piano recording "Common Places" was awarded Solo Piano Recording of the Year by solopianoradio.com in 2007 and in 2005 she received an RIAA Gold Record for her recording and updated arrangement of the "James Bond Theme".
Distant Memories is the third piece from Alexina Louie's "Music for Piano".
 It was commissioned by the Alliance for Canadian New Music Projects in 1982.
 This piece features the changing meters and "senza misura", meaning "without measure".
 The other pieces in this songbook is "Changes", "The Enchanted Bells", and "Once Upon a Time".
 The four short solo piano pieces explore contemporary musical concepts and techniques while remaining accessible to younger students.
 As this was her first set of compositions for solo piano, it is fitting that Louie dedicated the pieces to her former childhood piano teacher and mentor Jean Lyons.
Concerto for Solo Piano (French: "Concerto pour piano seul" ) is a 3-movement solo piano piece written by Charles-Valentin Alkan.
 The pieces are part of a 12 piece cycle entitled "Douze études dans tous les tons mineurs" (12 Studies in the Minor Keys), published in 1857 (although it may have been written some years earlier).
 With sections marked "Tutti", "Solo" and "Piano", the piece requires the soloist to present the voices of both the orchestra and the soloist.
 The pianist Jack Gibbons comments: "The style and form of the music take on a monumental quality—rich, thickly set textures and harmonies ... conjure up the sound world of a whole orchestra and tax the performer, both physically and mentally, to the limit."
Kreisleriana, Op.
 16, is a composition in eight movements by Robert Schumann for solo piano, subtitled "Phantasien für das Pianoforte ."
 It was written in only four days in April 1838 and a revised version appeared in 1850.
 The work was dedicated to Frédéric Chopin, but when a copy was sent to the Polish composer, "he commented favorably only on the design of the title page".
 "Kreisleriana" is a very dramatic work and is considered to be one of Schumann's finest compositions.
 In 1839, soon after publishing it, Schumann called it in a letter "my favourite work," remarking that "The title conveys nothing to any but Germans.
 Kreisler is one of E. T. A. Hoffmann's creations, an eccentric, wild, and witty conductor."
 In 1843, when he had moved from writing for solo piano to much larger works, in particular "Paradise and the Peri", he still listed it as one of his best piano works