Pierre Boulez is a giant of C20 music and his 1984 piece Repons is a real masterpiece. It combines instruments and live electronics in an energetic and sparkling score with much detail to discover on repeated listenings.
Give it a go – it really is worth a listen
Boulez, who will be 90 in March, spent much of his career at the experimental electronic music studio he founded in Paris (IRCAM). Repons, like much of his work, is serial but has a panache and flamboyance not always found in modernist composers