There are good reasons why structuring by material or medium does not work for performing arts collections. Documenting a performance - which is "intangible" - requires collecting in a wide variety of media https://twitter.com/TheArtNewspaper/status/1377711243750948869

Back in 2006 I came up with nine methodologies. this may need updating:
1. Preserving the play text, the musical score or the dance notation.
2. Recording the fact that a performance took place, whether on a card index or in a database or published volume.
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3. Collecting the by-products of performance (for example, programme books and publicity material; journalism, criticism and reviews; photographs; prompt scripts, designs)
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4. Collecting objects used in or associated with a performance, (for example, costumes, make-up, property, scenery, musical instruments and stage technology items).
5. Preserving and documenting the built heritage of the performing arts
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6. Collecting documents and archives relating to performing arts administration, management, production and funding.
7. Collecting biographical information relating to individuals associated with the performing arts.
8. Collecting audio and video recording of performances.
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9. Collecting oral history and other proactive documentation.
There's a bit more context here http://rescen.net/rwht/archive/PaK_may06/PaK06_transcripts4_1.html

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