The ratios of the light frequencies were converted into ratios of sound. The relative relationship between light frequencies was kept. The result was strange, beautiful music. I find it very arresting. It sounds alive to me.
Microtonal pitches are nothing new in music, however.
Some cultures have a long history of their use, especially those of India and the Middle and Far East. These sounds from the molecular world are remarkable. They may mean something - they may mean nothing. Alexjander says her music produces a strong reaction. It's a theory.