Sibelius is a music notation software that allows composers and musicians to create, edit, and print sheet music. It provides a user-friendly interface with various tools for composing, arranging, and orchestrating music. The software supports a wide range of musical symbols and offers playback features to hear compositions in real-time. Originally developed by Avid Technology, Sibelius is widely used in educational institutions and by professional composers. It is compatible with both Windows and macOS operating systems, making it accessible to a broad audience. The software also includes features for collaboration, enabling users to share their work easily.