Be-Music Source JSON Song File
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What is a BMSON file?
Be-Music Source, or BMS, is a song format used by Konami Beatmania and several derivative rhythm games, such as Bemuse. Each BMS song is saved as a directory that contains a plain text BMS file and several audio files (often .WAV or .OGG files). The BMS file defines the song's music, note positions, sound effects (such as the sounds played when a player succeeds or fails at hitting a note), and other information.
To make creating, editing, and loading BMS songs easier, various rhythm game enthusiasts collaborated to create the BMSON format. BMSON files serve the same function as and are similar to BMS files, except that they use JSON formatting. Formatting data using JSON, rather than an arbitrary standard, makes it easier for song creators and rhythm game developers to parse the data that BMSON files contain.
How to open a BMSON file
If you want to edit a BMSON file, it is best to open it with a dedicated BMSON editor, such as BmsONE (Windows, Mac). This will allow you to more easily view, understand, and edit the data your BMSON file contains. However, you can also open and edit a BMSON file with Microsoft Visual Studio Code or any other text editor.
You can play BMSON format songs in Bemusic Bemuse (Web) and raindrop (Windows, Linux).