Sounds like your church doesn’t actually have a DoM, but rather an à la carte choir director, who is just one of many equal musicians tasked with providing music for a particular weekend Mass. A DoM would have oversight of music at all liturgies, and, as a “director”, would assign personnel as he sees fit. In places with many divergent groups under the guidance of one DoM, a common and logical approach is to combine forces for the biggest days, rather than pick and choose and cause widespread disappointment like you’re experiencing.
But it sounds like your choir director isn’t at liberty to set a schedule for everyone, which leads me to believe he’s no director but just a musician on equal footing with the Saturday-night pianist.
but sometimes pastors have many constitutencies to please
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