That's what I thought as well. In the book Mass and Vespers, the tract verses are numbered. At the first double bar line is 2, not 1. Ditto for the psalm-tone tracts in the Brevior and for Palm Sunday in the 1960s LU. If the first part of the chant is not a verse/-icle, nor an antiphon, nor a respond, I'm not sure what else it could be. Besides, isn't the tract traditionally considered the example of direct (i.e., non-antiphonal, non-responsorial) psalmody in the Roman rite? In Psallite Sapienter, Andrew Mills says that only the first half choir comes in at the star (no. 96), but I'm told the practice at the FSSP seminary is for the full choir to come in at the star, then start the right-left alternation at the double bar line, and someone in my parish insists that's the correct way. But he also claimed that the star at beginning always means the full choir comes in, which is actually not the case for other chants that are sung in alternation.I was told by our schola director that the first part is also a verse, despite the absent on the V/. sign.
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