Chroma, a startup backed by Twitter and Pinterest co-founders, has been sold to AI audio company Bronze.Bronze makes tools for artists to create generative, interactive, or personalized music experiences.Chroma and Bronze worked together on an app called 'Lux Aeterna' that offers an audiovisual experience.The deal involves converting Chroma stock to Bronze stock, and an API will be created for the Lux Aeterna engine.