So here is the the first portion of the fourth chorus in Eurip. IA ripped from Kovacs LCL 2003.
see also:Eurip. IA 1036-1048
Text and Translation: David Kovacs
τίν᾿ ἄρ᾿ ὑμεναίοις διὰ λωτοῦ Λίβυος
μετά τε φιλοχόρου κιθάρας
συρίγγων θ᾿ ὑπὸ καλαμοεσ-
σᾶν ἔστασαν ἰαχάν,
ὅτ᾿ ἀνὰ Πήλιον αἱ καλλιπλόκαμοι
Πιερίδες μετὰ δαῖτα θεῶν
ἐν γᾷ κρούουσαι
Πηλέως ἐς γάμον ἦλθον,
μελῳδοῖς Θέτιν ἀχήμασι τόν τ᾿ Αἰακίδαν,
Κενταύρων ἐν ὄρεσι κλέουσαι
Πηλιάδα καθ᾿ ὕλαν;
What cry, in their wedding hymns, did they raise
to the Libyan pipe
and the cithara that loves the dance
and to the strains of the reedy syrinx,
when upon Pelion’s ridges the fair-tressed
Pierian Muses were coming,
striking their gold-sandaled
feet on the earth,
to a feast of the gods, the marriage of Peleus?
I noticed Kovacs renders this opening section as a question while Philip Vellacott does not. τίν᾿ ἄρ᾿ l.1036 is obviously a question marker. It appears that the chorus raises a question and answers it. Having no better resource on hand I picked up Helma Dik 2007 and looked at her treatment of questions in tragic dialogue. But I can see problems right away with her prototypical format for clause articulation. It isn’t going to work in a chorus. Right?