I'm inclined to believe perhaps GZ's statements earlier were a semi-call for
suggestions, so here's mine (commentary welcome):

Cinda's Companion Cantata
Level: 49th+
Skill: Variable (see below)
Description: A cantata is a composition scored for many parts at once,
incorporating both voice and instrumental accompaniment, hence this song
would allow bards in the same group to ally their voices in song to
intensify the effects of a common song - to "stack" the same song, perhaps
with at 100*(2-((6-n)^(1/6)))% effectiveness, where n is the number of bards
playing cantata. Yes, this could be exceptionally powerful, what with
twisting and all, but this could easily be limited to only effect the "top"
bard song in the spell list of the lead singer, whilst the "recovery" period
of stopping the song would be such that twisting wouldn't be possible if you
were a cantata player.
Example: A group composed of 1 warrior and 2 bards stops to rest. Bard 1
begins to sing Hymn, only to be joined in song by bard 2 with Cinda's
Cantata - boosting regeneration by their now intensity music (by the SWAG
formula above that would be a +69%).
Full stacking numbers would be:
n +%
--- -----
1 69
2 74
3 80
4 88
5 100
Anyhow, I have no idea how to make a formal suggestion that wouldn't be lost
in /feedback, but none the less, here's mine. Also, this would be a
beautiful deeply involved story line "quest" song as we're currently lacking
anything to do once we get our lambent.

-GW
<Tork@Nameless>