The Pointed Blade that Sings

Weapon Magical, Silvered, Finesse Uncommon (this item requires attunement) [Enchantment]

Must be attuned to by a bard.   When you make a hit against a hostile target with this fine silver rapier, it vibrates, 'singing' a note that harmonises with the note made by the weapon impact.   After landing a hit withthis weapon, you can immediately use a bonus action to use your bardic inspiration ability. If you do so, the beneficiary adds your proficiency bonus to the result of the inspiration die when they roll it.