This program is no longer being maintained or updated.
For an unofficial open source build with the latest instruments and other additions, go here
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Minecraft Note Block Studio
Current version: 3.3.4
Last updated: 2018.01.31

The Minecraft Note Block Studio is a music editor for the popular sandbox game Minecraft. Get it now COMPLETELY FREE! No kidding!
The downloads are for only

Download older version (3.2.1)
Minecraft Forums topic (deleted)
Minecraft Wiki page
File format
My home page

Screenshots (click to enlarge):