Melodic Chain is an enchanted elven chain armor +3, which offers an base armor class of 2, but can only be worn by bards.
The armor is only found during the side quest Rescue Raelis and Haer'Dalis from the planar prison in Shadows of Amn campaign, a loot from the starting battle with Bounty Hunters and thralls.
|“||The Bards of Melody were a small band of half-elf bardic warriors who entertained and defended scattered elven communities throughout Calimshan. Enchantments allowed only minstrels to wear their armor, the magical links sliding together to produce beautiful melodies as they danced or fought. Unfortunately the Bards of Melody were disbanded hundreds of years ago, and the secret of 'playing' the armor faded with them.||”|