 His notable compositions include the series of nineteen Klavierstücke ( Piano Pieces ) , Kontra @-@ Punkte for ten instruments , the electronic / musique @-@ concrète Gesang der Jünglinge , Gruppen for three orchestras , the percussion solo Zyklus , Kontakte , the cantata Momente , the live @-@ electronic Mikrophonie I , Hymnen , Stimmung for six vocalists , Aus den sieben Tagen , Mantra for two pianos and electronics , Tierkreis , Inori for soloists and orchestra , and the gigantic opera cycle Licht . 
