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In page Heinz Holliger:
"On the occasion of Paul Sacher's 70th birthday, Holliger was one of twelve composer-friends of his who were asked by Russian cellist Mstislav Rostropovich to write compositions for cello solo using his name spelt out in German names for musical notes on the theme (eS, A, C, H, E, Re); Holliger contributed a Chaconne for Violoncello Solo. The compositions were partially presented in Zurich on 2 May 1976. The whole "eSACHERe" project was (for the first time in complete performance) performed by Czech cellist František Brikcius in May 2011 in Prague.[4]
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