Cultural Diversity

A couple of my parishioners had occasion to spend Easter in South Korea. They attended Mass at the (Anglican) Cathedral Church of the Advent in Seoul. They brought me several interesting materials, including this:
If you are somewhat musically literate and somewhat familiar with Anglican worship, you will recognize the music. First prize, though, goes to whomever can tell me what the text is. (And I'm already guessing that the last two lines are Gloria patri...)