What Is Sibelius Portable? Sibelius is one of the world’s leading music notation software packages, used by composers, arrangers, educators, and students to create, edit, and print professional-quality sheet music. A "portable" version of Sibelius refers to a modified installation that runs entirely from a USB flash drive or external hard drive without needing to be installed on the host computer’s operating system.
If you choose to create a portable version, do so legally, respect Avid’s copyright, and keep a backup of your USB drive.