The Fastest, Smartest, Easiest Way to Write & Share Music. Create beautiful, captivating scores more quickly than ever before with the world's best-selling notatino software. Sibelius _ Ultimate is the complete notation toolset and extensive score customization for professionals and educators. Sibelius is the world's best-selling notation software for musicians, composers, orchestrators and students that want to produce richly detailed scores. Sibelius features comprehensive tools for music composition, transcription, editing, and unique cloud-based workflows so users can easily share and review scores anywhere.