"French is, in many ways, more difficult for an English-speaking person to sing. It is so full of complex and trying vowels. It requires the utmost subtlety."

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To make music means to express human intelligence by sonic means. This is intelligence in its broadest sense, which includes not only the peregrinations of pure logic but also the "logic" of emotions and intuition. My musical techniques, although often rigorous in their internal structure, leave many openings through which the most complex and mysterious factors of the intelligence may penetrate.

— Iannis Xenakis