No problem. I am sorry, I misunderstood your question.
You are asking if a bard song with multiple effects (snare + slow) would stack with a pure slow if I understand correctly now.
EDIT: Simplifying my answer. When offensive spells have multiple effects such as snare + slow, it's a little trickier to discern which debuff slot they will take. I believe a snare will generally take the snare debuff slot over other debuff slots, which is why you can stack Willsapper + Snare/Slow song, but you cannot stack a pure snare with snare/slow song. However, I am quite certain the slow percentages would not be cumulative. The game simply uses the highest value. So if the Bard Song slows the mob by 20%, and Willsapper slows the mob by 35%, the mob is still only slowed by 35%, it does not get added together for a total of 55%.
I think snare + damage gets weirder, because I can't remember if the Clinging Darkness line of spells stacks with the druid equivalent snare + damage line. I have not tested that (or payed attention to it) in quite some time. I know you can't stack multiple versions of the Clinging Darkness line of spells, even though you can stack other DoTs like multiple disease DoTs of the same line.
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