Chant & Music

OLS v1.0 separates text from chant metadata while allowing them to be linked.

{
  "chant": {
    "system": "yared",
    "mode": "geez",
    "zemaType": "deggwa",
    "source": {
      "book": "Deggwa",
      "page": "234"
    },
    "performance": {
      "tempo": "slow",
      "antiphonalPattern": "cantor-congregation",
      "instruments": ["kebero", "tsenatsil", "mequamia"],
      "standingPosture": true
    }
  }
}

Reuse Chant Metadata

Attach chant metadata at the narrowest level where it is true:

• Attach it to an utterance when the whole utterance shares one mode and performance treatment.
• Use sub-utterance alignment when mode, milikit, or phrasing changes within the text.
• Reference an asset when a recording or notation file demonstrates the chant.

Text and chant should remain independently addressable. The same text may have several chant realizations, and a chant record should cite its musical source rather than relying only on the text’s citation.

Performance fields describe a rendition or established practice. They do not replace rubric fields when an action, posture, or instrument use must be validated as part of service execution.