Frostreaver 2 groupable MOTM targets? (Frostreaver) (4 Viewers)

[Bethania]

I run a 5 cleric chain in a group with a Bard running double mana song, and I can set it and forget it and they can run indefinitely mana-positive at delays higher than 30. Below that they can go a long time but not indefinitely, unless i more actively monitor them for ducks and such. Been working on a LEM that will do the same but duck the heal automatically if the target is above 90% when the heal is about to land (9 seconds or so after cast), but that's not ready for prime time yet.

How do you do the double mana song on a bard?