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This was composed for the celebration of Pierre Boulez's 60th birthday concert. In English, this translates to Rough Breathing/Smooth Breathing, and refers to the pronounciation of classical Greek words beginning with a vowel or an R. With Esprit Rude, the initial vowel (or R) is to be preceded by a sounded H, which is indicated in the music by a reversed comma above the letter. With Esprit Doux, the initial vowel is not to be preceded by H and is inicated by a comma above the vowel. Both instruments have some rough and some smooth breathing.