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There is a Legacy version here.

PFS StandardEducate Allies [reaction] Feat 6

Bard Concentrate 
Source Player Core pg. 103 2.0
Prerequisites Well-Versed
Trigger An ally benefiting from one of your composition spells is subject to an effect with the auditory, illusion, linguistic, sonic, or visual trait

You tweak the properties of your composition spell to convey a bit of your defensive knowledge. All allies affected by your composition spell gain your +1 circumstance bonus from Well-Versed until the start of your next turn. Teaching your allies also bolsters your own skills; your personal circumstance bonus from Well-Versed also increases to +2 until the start of your next turn.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.