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The span of this Irish composer's recorded works encompasses 30 odd years, having released something on the order of 25 albums (including an LP,
Rapid Eye Movements, on Steven Stapleton's United Dairies in 1981), in addition to creating scores of commissioned works for theater (Doyle is a co-founder, along with Olwen Fouere, of the Operating Theatre group) and others.
The Ninth Set is the third and final volume in his major work
Passades, which Doyle worked on between the years 2002 and 2007, composed as an accompaniment to a wordless Operating Theatre production with the music performing the role of the text.