[MarMema]

Geeze, I love that little hymn we do, and did tonight for the odes.
Do you think you use the same one?

[Agrarian]

I assume that you are talking about the irmosi sung at the beginning of each Ode of the Canon (e.g. at Ode I: "Of old Thou didst bury the pursuing tyrant beneath the waves of the sea. Now the children of those who were saved bury Thee beneath the earth, but with the maidens let us sing to the Lord, for gloriously has He been glorified.")

The most commonly used melody for these in the OCA are harmonized Znamenny chant. And they are indeed solemn and beautiful. The only time they are used in modern practice is on this weekend, so they have taken on a "seasonal" character.

We repeat these same irmosi (with a different canon) at Midnight Office to start the Pascal Vigil -- an echo of Holy Saturday's Matins, and bringing the Triodion to a close. With Matins of Pascha that begins immediately following, the Pentecostarion begins, and the entire Paschal season. Quite exciting!