thks for the prompt 
to add to that, iāll try to explain the reasoning from my point of view, since the present theatre guidelines donāt actually say whatās the best practice in cases like these.
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since all SPAs are merely placeholders and donāt really point to any particular known artist whether you tag such credits to an SPA or not, i reckon that if you donāt need to resort to SPAs to set a credit for any recording (or other entity), then itās probably better to just dispense with their use, and thatās becauseā¦
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if you assign a credit like āChorusā to [theatre], it only gets aggregated to the long list of artist credits already associated with that SPA. beyond that, it goes no further to ascertain who are that group.
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another alternative, which some might have considered, is to piggyback such credits onto one or more preceding known artists in those particular recordings, letās say crediting Alfred Drake as āAlfred Drake and Chorusā. but this approach has one drawback; it adds an inappropriate artist credit to Alfred Drakeās list of aliases, since thatās a name youād not likely imagine Drake himself to have ever used, or that it was an artist group of which he was a member. itās just an ad hoc ensemble.
so, if the conditions allow it, i feel we can dispense with tagging these credits to any SPAs, and only resort to them when we have to.