[Jete]

Taken from EQClassic.org and it seems everyone agrees:

-Cassindra's Chorus of Clarity, level 32, original era, has no icon. It's a flat 5 mana per pulse.
-Cassindra's Chant of Clarity, level 20, Kunark era, has no icon. This is 2 mana per pulse.
-Cantata of Replenishment, level 55, Kunark era, *is* an icon buff. It's a base of 12 mana per tick at level 55.
-Cantata of Soothing, level 34, Velious era, *is* an icon buffs. Base of 5 mana/tick.

So, from Kunark on out, the "best" mana song will have an icon. It can be twisted with the level 32 pulse-based song, though, so it's kind of the best of both worlds.
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However much it pisses me off its true. Manasong shouldn't have a song graphic bards can stack manasongs since they are pulse based. It pretty much destroys twisting since you just cast it over and over..... So yay for bard manasong auto-attack /afk!

*Edit* (and gonna piss people off with this)
I think it should be left as-is. The same way I think -40%xp should be taken off rangers. Just my worthless 2cp.