Add @soundio/music-json

Author: burningtree

README.md

@@ -156,6 +156,8 @@ Inspired by the [awesome](https://github.com/sindresorhus/awesome) list.
 * [survey.js](https://surveyjs.io/form-library) - JSON based survey library.
 * [JSON Meta Application Protocol (JMAP)](https://jmap.io/) - A protocol for synchronising JSON-based data objects efficiently, with support for push and out-of-band binary data upload/download.
 * [J<sub>ack</sub>SON: JSON secret keeper](https://github.com/rosehgal/jackson) - JSONic way of storing secrets in config file.
+* [Sequence JSON](https://github.com/soundio/music-json/) - A proposal for a standard way of creating music sequence data in JSON.
+
 
 ## Frontend components
 * [JSON editor jQuery plugin](https://github.com/DavidDurman/FlexiJsonEditor) - component for you web apps/pages. (jQuery)