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From Pathfinder #170: Spoken on the Song Wind, which isn't enabled.

Singing Muse

ITEM 6
Price 250 gp
Usage affixed to armor
Bulk —
Category talisman

Usage affixed to armor

Activate envision
Trigger You attempt a Performance check.

This small figurine is carved from a single piece of silvery, spiky stone and resembles a beautiful dryad pouring water into a small pool. When you activate the muse, you are momentarily enlightened with inspiration that bolsters your performance. If you roll a success on your triggering check, you get a critical success instead.

Pathfinder #170: Spoken on the Song WindOGL