Jeff Ostrowski has posted a great 4 part choral piece that lends itself to being sung in 2, 3 or 4 parts. Start out in 2 - when a tenor shows up, move to 3 and then add a bass!
Interesting, but unfortunately only the "Hosanna" (not the Sanctus or entire mass setting) is provided. Moreover, it is different from the Morales Missa sobre las voces (complete) at CPDL, which is also an "Ut re mi fa so la" setting and quite singable.
Okay, mystery solved. The Hosanna available at ccwatershed is from the "Tarazona version" of the Benedictus-Hosanna for the Missa sobre las voces at CPDL – indeed, also known as Missa super ut re mi fa sol la and available (along with the Tarazona version) for free download here.
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