Bard

[Blah]

I agree.
I haven't payed much attention to the current emotes for BRD though.

String:
Just strum the instrument repeatedly?
Wind:
Blow into the instrument while moving the hand?

I didn't notice it at first either until I started playing Bard. With the wind instruments your character holds all of the instruments to the side and blows into it like a flute, piccolo or recorder (and it sounds like a flute too). With string your character just whips out a harp and strums on it and since they're all harps there's no way to tell if it would be the same if it was say a lute or banjo. But since most of the wind instruments are horns (especially as you get higher) you can clearly see your character holding a horn off to the side and NOT blowing into the hole or at least I can I don't know about any1 else.