Edgard Victor Achille Charles Varèse (French: [ɛdɡaːʁ viktɔːʁ aʃil ʃaʁl vaʁɛːz]; also spelled Edgar Varèse; December 22, 1883 – November 6, 1965) was a French-born composer who spent the greater part of his career in the United States.
Definition from Wikipedia – Edgard Varèse
Ionisation (1929–1931) is a musical composition by Edgard Varèse written for thirteen percussionists. It was among the first concert hall compositions for percussion ensemble alone, although Alexander Tcherepnin had composed an entire movement for percussion alone in his Symphony No.
Definition from Wikipedia – Ionisation (Varèse)