Where can I find a byzantine melody for the Exaposteilarion of the Transfiguration (Φῶς ἀναλλοίωτον Λόγε / O changeless light)? It is listed as an automelon but I haven't found it in any irmologia yet. Is it considered to be more of a prosomoion? I see that Fr. Seraphim Dedes score on the DCS says "Having embellished" above the melody (which is his translation for Ὁ οὐρανὸν τοῖς ἄστροις). However, what I have heard and seen on western scores reminds me more of Εν Πνεύματι τω ιερώ but shorter.