# Open Music Collection

> An open standard for music collections: items (songs and albums) with copies on sources, lists, a newline-delimited JSON collection file, source descriptors, and a rule that every app keeps data it doesn't understand.

- [Instructions for agents](https://www.tangle.music/omc/agents.md): how to export, import and host OMC data correctly
- [Core 1.0 specification](https://www.tangle.music/omc/spec/): items, copies, sources, lists and the OMC file format
- [What belongs where](https://www.tangle.music/omc/spec/where/): which of six places a property or endpoint goes in
- [Changelog](https://www.tangle.music/omc/changelog/): what was decided, and when
- [JSON Schema](https://www.tangle.music/omc/schema/core-1.0.schema.json): validates one line of a collection file
- [Source descriptor schema](https://www.tangle.music/omc/schema/source-descriptor-1.0.schema.json)
- [Modules](https://www.tangle.music/omc/modules/): Access (the protocol for apps), DJ, Feeds, Share, Collector, Catalog and Commerce, Delivery, Folder (drafts)
- [Examples](https://www.tangle.music/omc/examples/)