As found in the Oxford Music Online encyclopedia (only accessible through
universities):
Corcoran has developed a distinct and complex language of aleatory
macro-counterpoint in which sound layers are superimposed polyphonically but
retain independence through distinctive polymetric, agogic and dynamic
indications. This technique is evident from the early Piano Trio (1978) to Ice
Etchings no.1 and Mad Sweeney (both 1996). His many cultural interests are
reflected in the texts of his vocal works; the opera Gilgamesh (1990), for
example, is based on a Sumerian epic. The Irische Mikrokosmoi for piano (1993)
are based on traditional Irish melodies and rhythms.