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THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands. (Photo by Patrick van Katwijk/Getty Images)

THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands.  (Photo by Patrick van Katwijk/Getty Images)

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THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands. (Photo by Patrick van Katwijk/Getty Images)

THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands.  (Photo by Patrick van Katwijk/Getty Images)

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THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands. (Photo by Patrick van Katwijk/Getty Images)

THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands.  (Photo by Patrick van Katwijk/Getty Images)

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THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands. (Photo by Patrick van Katwijk/Getty Images)

THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands.  (Photo by Patrick van Katwijk/Getty Images)

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THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands. (Photo by Patrick van Katwijk/Getty Images)

THE HAGUE, NETHERLANDS - MARCH 22 : Queen Maxima of The Netherlands opens the symposium 'tomorrow more music in the class' in Palace Noordeinde on March 22, 2017 in The Hague, The Netherlands.  (Photo by Patrick van Katwijk/Getty Images)