[1] She describes: "I compose microtonal music strictly by ear and leave it to others to analyze, so you won't find ratios or mathematics here.
Walker had already released her debut studio album titled Blue Cartoon in 1989, before moving to work as ZIA.
Walker returned to solo work and self-released two studio albums, 2006's Martians and 2011's Drum 'n' Space.
[4] She has composed using various equal temperaments, including the Bohlen–Pierce scale: Stick Men (1991), Love Song, and Greater Good (2011).
[3] In the early years ZIA has also performed with Emergency Broadcast Network, A Flock of Seagulls, and Marilyn Manson in the Boston area.