Harmony vs Chanter Agro reducer vs Bard agro reducer

[Elements]

For the purpose of splitting camps outdoors, harmony seems incredibly valuable. Conversely the enchanters agro reduction line (calm, soothe, etc.) seem to cause havok when resisted and doesn't seem to offer the same reduction in range as harmony.

I am curious where a bards agro reducing song fits in? From what I can tell its single target but how long does it last? is it resistable? does it offer the same reduction in agro range as harmony, or is it more similar to that of an enchanter? From my vague recolection of 10+ years ago weren't bards able to split 3+ and 4+ pulls quite easily?