This article explains how to use the free notation software MuseScore to adjust MIDI files downloaded from the internet into a format that can be played on the Muro Box. It covers steps such as downloading MuseScore, obtaining MIDI files, opening them in the software, adjusting pitch range and octaves, setting instruments and range warnings, and fixing notes that exceed the playable range. The guide is designed to help users with sheet music reading skills edit MIDI files so the music box can perform their favorite songs.