I'm still curious to see where this ended up and how to improve on it.
Kyreth’s Amulet of Musical Accompaniment
Aura varies; CL varies
Slot amulet; Price 1000 gp (basic), 89500 gp (heroic), 77100 gp (frightening); Weight 1 lb.
This is a circular silver amulet with a small hole in the middle; when light hits its surface, multicolored rays of light play on its surface. It has a simple premise for those of a flamboyant nature: it continuously provides a musical accompaniment to every action made by the hero wearing it. This grants the wearer a +2 competence bonus to all Diplomacy and Intimidate checks, but causes a -10 penalty to all Stealth checks. Faint illusion; CL 1st; Craft Wondrous Item, ghost sound, creator must be a bard
Kyreth began to see the popularity of his creation and began to craft more powerful versions of the item with additional powers in addition to those mentioned above; each new amulet corresponded to a form of bardic performance. A popular variation is the amulet of heroic accompaniment. With this amulet, the wearer is continuously affected by the inspire heroics bardic performance as the music accompanying him constantly infuses his being with hope, courage, and optimism. Moderate enchantment; CL 15th; Craft Wondrous Item, ghost sound, greater heroism, creator must be a bard
Another popular variation is the amulet of frightening accompaniment. With this amulet, the wearer can cause fear in his enemies on command like the frightening tune bardic performance. Any enemies within 30 feet of the wearer that can hear the music must make a Will save (DC 19) or be frightened and must flee for as long as it can hear the music. A target that makes this save is unaffected by this amulet for 24 hours. Moderate necromancy; CL 14th; Craft Wondrous Item, ghost sound, fear, creator must be a bard