Alexander Scriabin
Alexander Scriabin was a Russian composer and pianist. He is famously regarded as a synesthete, but there is a lot of controversy surrounding whether he had chromesthesia or not. Scriabin was a major proponent of Theosophy, which had a system associating colors to feelings and emotions. This influenced the musician, who distinguished "spiritual" tonalities (like F-sharp major) from "earthly, material" ones (C major, F major). Furthermore, Alexander Scriabin developed a "keyboard with lights" or clavier à lumières, which directly matched musical notes with colors.