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His music has been performed at the 26th Warsaw Autumn International Festival of Contemporary Music, the Conservatoire Américain in Fontainebleau, France (where he taught in the summer of 1992), and the Philharmonia Orchestra.
In the 1960s, Kopelent became well known in contemporary European music circles, with his compositions being performed at such festivals as the Warsaw Autumn, Donaueschinger Musiktage, Witten music festival and the annual festival in Darmstadt.
Ricketson has received commissions from: Warsaw Autumn International Festival of Contemporary Music; the Transit Festival (Belgium); The Song Company; the Australian Chamber Orchestra; Symphony Australia; Continuum Sax; ABC Classic FM; the Portuguese-based Drumming Grupo de Percussão and the MLC School Burwood.