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From Pathfinder #205: Singer, Stalker, Skinsaw Man, which isn't enabled.

Gasping Lament (Greater)

ITEM 17
Price 14500 gp
Usage worn collar
Bulk —

This collar is a silken cord from which hangs a small silver amulet that bears the likeness of a woman with her hand at her throat. A gasping lament is a powerful coda instrument that's worn rather than held. While you sing, you gain a +3 item bonus to Intimidation checks to Demoralize and to Performance checks.

Activate Cast a Spell

Effect You expend a number of charges from the collar to cast a spell from its list.

Craft Requirements Supply one casting of all listed levels of all listed spells.
Pathfinder #205: Singer, Stalker, Skinsaw ManORC