Those composers are famous because they were pioneers in the development of music and their work has been used to educate musicians in virtually all countries during the last century. There are composers creating similarly valuable music today, sometimes working in cinema or video games, and composers doing pioneering work, usually in experimental music. They aren’t as famous because their work isn’t being used worldwide to educate musicians, but they might be by 2123, provided society hasn’t collapsed.
Those composers are famous because they were pioneers in the development of music and their work has been used to educate musicians in virtually all countries during the last century. There are composers creating similarly valuable music today, sometimes working in cinema or video games, and composers doing pioneering work, usually in experimental music. They aren’t as famous because their work isn’t being used worldwide to educate musicians, but they might be by 2123, provided society hasn’t collapsed.