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There is a Legacy version here.

PFS StandardEternal Composition Feat 18

Bard 
Source Player Core pg. 107
Prerequisites maestro muse

The world is a stage upon which you are always playing. You are permanently quickened; you can use your extra action only to cast a composition cantrip that requires 1 action to cast. While in exploration mode, you can declare that you are performing an eligible composition cantrip while using any exploration tactic. Even before your first turn in a combat encounter, that cantrip is active as if you had cast it on your previous turn.