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LONDON, ENGLAND - MARCH 14: The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England. (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

LONDON, ENGLAND - MARCH 14:  The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England.  (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

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LONDON, ENGLAND - MARCH 14: The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England. (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

LONDON, ENGLAND - MARCH 14:  The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England.  (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

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LONDON, ENGLAND - MARCH 14: The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England. (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

LONDON, ENGLAND - MARCH 14:  The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England.  (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

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LONDON, ENGLAND - MARCH 14: The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England. (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

LONDON, ENGLAND - MARCH 14:  The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England.  (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

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LONDON, ENGLAND - MARCH 14: The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England. (Photo by John Phillips/Getty Images for the London Symphony Orchestra)

LONDON, ENGLAND - MARCH 14:  The Rt Hon The Lord Mayor, Alderman Dr Andrew Parmley, performs as organ soloist in Saint-Saens' Organ Symphony with the London Symphony Orchestra conducted by Fabio Luisi in the magnificent setting of St Paul's Cathedral. The historic debut performance takes place at a gala concert in aid of the Lord Mayor's Appeal at St Paul's Cathedral on March 14, 2017 in London, England.  (Photo by John Phillips/Getty Images for the London Symphony Orchestra)