I remember reading about this in a German online article by Niklas Holzberg (classics professor from Munich) that was called "Wann sind Übersetzer lateinischer Poesie mit ihrem Latein am Ende?" - "When Do Translators of Latin Poetry Reach the End of Their Latin*?" * "mit seinem Latein am Ende sein", lit. "to be at the end of your Latin" is a German idiom that means "to be at your wit's end" / "to have no (more) idea(s)" The article was here, but unfortunately it seems to have been taken offline. I still have it on my computer, but I don't know if I'm allowed to upload it here. He made the observation that in a lot of great works, the first verse features a parade of all 5 basic vowels (a, e, i, o, u) before the middle caesura in the 3rd foot (penthemimeres). That is certainly true for the Aeneid, but I've also noticed that it happens a lot in Ovid's opera: Vergil, Aeneid arma virumque cano // Troiae qui primus ab oris Ovid, Amores arma gravi numero // violentaque bella parabam Ars si quis in hoc artem // populo non novit amandi (The hyperbaton here in hoc <> populo does not only move "artem", essentially the title of the work, into a more prominent place right before the caesura, it also helps to fulfil the premise of having all vowels in there) Metamorphoses in nova fert animus // mutatas dicere formas Fasti tempora cum causis // Latium digesta per annum Tristia parve nec invideo // sine me liber ibis in urbem (this is a bit of a stretch because you would have to equate the "v" in parve or invideo to a u) All of this already seems to have its roots in Homer's Odyssey: andra moi ennepe, Moysa (= Musa), // polytropon, hos mala polla Holzberg only focuses on the beginning of the Aeneid and the Amores, and he writes that in the past, people had doubt as to whether that parade of vowels was intentional. However, it seems like this phenomenon is not that rare, so I'd say there's reason to believe that it was done on purpose. If so, I wonder what the intention is ... I'm not very knowledgable at music, but it reminds me a bit of a singer warming up for a song by going through all of the notes once again. Do you think that's plausible?