MUP is a document file that stores music notation. MUP files are created by Music Publisher. Software. The application was develped by Braeburn Software company, but after retirement of its owner in 2014 the company was acquired by Lauriso Software. Music Publisher is no longer available for purchase.

MUP format allowed users to store sheet music with notes, time signatures, instruments, and other musical score information. MUP documents can be printed. Music Publisher offered and option to playback the created composition.