Dev Hynes, who records as Blood Orange, has given some of the most articulate firsthand accounts of chromesthesia in modern music: describing colors and textures for chords and timbres, speaking about it at length in interviews and public conversations, including with neuroscientists, and composing orchestral work explicitly framed as translating his synesthetic experience for audiences.
His descriptions are specific about mechanics: harmony carrying color, production texture carrying surface quality, and mixing decisions guided by whether the picture looks right.
Among living musicians his case pairs unusually well with the science, since he has participated in exactly the kind of public, detailed questioning that lets his reports be compared with the clinical literature on music-color synesthesia.