The 15th:
Thanks to Michalis @gibson355 for uploading it here. (Where do you find these things, my brother! But it is also Bülent Cingöz’s treasure trove, as I assume that’s the name of this great Turkish YouTuber.)
Turkish recording, 1925. Title: Zeybek Havası (written in Ottoman Turkish using the Arabic script, and phonetically transliterated into the Latin alphabet—here I’m writing it in modern Turkish orthography). In parentheses, something rendered in English as “Mountaineer’s Dance”, the dance of mountain dwellers. Performed by the Smyrna Quartet, and according to the label, sung by Moise Efendi, though according to my ears, by no one.
Almost identical to the Limneiko. Three themes repeated cyclically, two of which are the two themes of the Limneiko, L1 and L2, while the third is K1, which we have encountered in seven other of the 15 variations: in the four Cypriot ones (#10 and #21 recordings, #19 and #22 in sheet music), in Tom Stathis the Kirkilisian’s (#26), in another modern version with unknown details (#27), and in the Turkish version by Kemani Hasan (#37), but in no rebetiko recording, nor in the third Turkish variation, by Tambouracı Osman of Pehlivan (#58).
We haven’t found the piece completely identical anywhere else, though, just as we haven’t found the Limneiko—or any other piece among the 15 so far, unless I’ve missed something.