nazard wrote:Surely the words acclaim the Lord and implore His mercy, the music is just meant to make the meaning more obvious. It is still a piece of perfectly good liturgy if the words are said.
Bit of a non-sequitur in the context of the discussion so far? The issue isn't whether you sing the Kyrie or not, but what its purpose and/or meaning might be.
To address your point, though: I think you're wrong. Some prayers in the liturgy are actually songs. If you recite them instead of singing them, they're incomplete. (They might still be valid, but 'valid' isn't the same as 'perfectly good'.) The words Alleluia, Hosanna and Gloria are all like that: biblically speaking, they're songs, and saying them instead of singing them is a bit like having everyone recite the words of the national anthem before a rugby international.
I think the Kyrie probably comes in the same category, though less compellingly, to my mind. (The bishops of England and Wales seem to agree: the Kyrie comes in the next category down from the Gloria in the scheme of items which it's important to sing.)
Historically speaking, by the way, I don't think the Kyrie is actually penitential in character at all. If memory serves, it's a vestige of the Prayer of the Faithful (i.e. it's the response to repeated invitations to petitionary prayer). Certainly in the eastern liturgy at around this point you still get a litany of petitions - for peace, for salvation, for the church - to which the (sung) response is Lord, have mercy. There are Taizé litanies that do the same thing.