Free online MGU to MSCZ converter

Band-in-a-Box stores songs as MGU files, while MuseScore uses MSCZ for editable scores. Convert an MGU when you need to open the music in MuseScore or share it with someone who works in that format.

What the MGU format is

MGU is a Band-in-a-Box song file that includes a melody along with chord and accompaniment information. You may encounter it when receiving a song created in Band-in-a-Box; the related SGU format is used for songs without a melody.

What the MSCZ format is

MSCZ is MuseScore’s compressed native score format. It stores editable notation and score layout, making it suitable for continuing work in MuseScore or sharing a score with other MuseScore users.

How to convert MGU to MSCZ

Online on 101convert.com

1. Upload the MGU file on the converter page.
2. Choose MSCZ as the output format and start the conversion. The conversion runs on the server with MuseScore; multiple files can be processed as a batch. Check the page for its per-file size limit.
3. Download the converted MSCZ file.

Offline with desktop software

MuseScore is free and available for Windows, macOS, and Linux, but it does not directly open MGU files. Use Band-in-a-Box to export MIDI, then import that MIDI into MuseScore and save the score as MSCZ.

1. In Band-in-a-Box, open the MGU file and use File → Save Song As → MIDI File to export a MIDI file.
2. In MuseScore, open the MIDI file with File → Open. Review the imported notation, then use File → Save As and choose MSCZ as the format.

Band-in-a-Box is commercial software for Windows and macOS. If it is unavailable, MuseScore alone cannot perform this offline conversion from MGU.

What may change during conversion

MIDI carries musical events, not Band-in-a-Box’s full song structure. The exported score may not retain editable chord and style information, and MIDI import can require notation cleanup, including rhythm and instrument review.