Lute of Thunderous Thumping
Source: Dungeon Master's Guide
Weapon (Club), Very Rare
This reinforced lute can be wielded as a magic Club that deals an extra 2d8 Thunder damage on a hit.
Sing and Swing. If you’re a Bard, you can use your Charisma modifier instead of your Strength modifier when making a melee attack roll with the lute, provided you sing or hum while making the attack.