About Chroma, Paul Zonn wrote:

“Chroma was written for Wilma Zonn as a virtuoso vehicle making use of several (of the then) “new’ oboe techniques, such as multiphonics, double-note trills, microtonal pitch changes, and coloration of notes. We had begun to investigate and catalogue these and other advanced techniques as compositional devices as early as 1962. When I completed Chroma in 1967, I hoped at that time that I had managed to integrate the unusual sounds into the compositional fabric in a convincing and natural way.”