Wendy, I'm going to play my parts into GarageBand in the original key, then transpose it a half-step up within GarageBand. (So I'm not pitch-shifting the audio as we would do with a violin or whistle part; my original audio will come out in the raised key.) I think people can play in whichever key (G or A-flat) is easier for them, and we'll deal with it accordingly (except the vocals, which I don't think we want to pitch-shift).
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