Operas
- In Memoriam... Kit Carson (1963)
- That Morning Thing (1967)
- Music with Roots in the Aether (television opera) (1976)
- Perfect Lives (television opera) (1978–83)
- Atalanta (Acts of God) (1982–91)
- Now Eleanor's Idea tetralogy:
- Improvement (Don Leaves Linda) (1985)
- eL/Aficionado (1987)
- Now Eleanor's Idea (1993)
- Foreign Experiences (1994)
- Balseros (1997)
- Your Money My Life Goodbye (1998)
- Dust (1998)
- Celestial excursions (2003)
- Concrete (2006)
Ashley has written many other pieces for combinations of instruments, voices, and electronics. A complete list can be found at his official website.
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