This was new to me as I have been aloof for a bit. Perhaps you are already aware, but there is available on Youtube a recording of the earliest extant Christian hymn with musical notation, P. Oxy. XV 1786. Coming from the 3rd century, this hymn worships the Father, Son, and Holy Spirit. Invoking both speech and song, this musical ditty is truly incredible. Enjoy!

“(Spoken) [Σε Πάτερ κόσμων, Πάτερ αἰώνων, μέλπωμεν] ὁμοῦ, πᾶσαι τε Θεοῦ λόγιμοι δο[ῦλο]ι. Ὅσα κ[όσμος ἔχει πρὸς ἐπουρανίων ἁγίων σελάων.]
(Sung) [Πρ]υτανήω σιγάτω, μηδ’ ἄστρα φαεσφόρα λ[αμπέ]
(Spoken) σθων, [ἀπ]ολει[όντων] ῥ[ιπαὶ πνοιῶν, πηγαὶ]
(Sung) ποταμῶν ῥοθίων πᾶσαι. Υμνούντων δ’ ἡμῶν [Π]ατέρα χ’ Υἱὸν χ’ Ἅγιον Πνεῦμα, πᾶσαι δυνάμεις ἐπιφωνούντων· Ἀμήν, Ἀμήν. Κράτος, αἶνος [ἀεὶ καὶ δόξα Θεοὶ δωτῆρι μόνῳ πάντων] ἀγαθῶν· Ἀμήν, Ἀμήν.

HT: Mike Bird and Mark Goodacre