Bagpipes of Disturbance (Cursed)

Upon using this magic item, the user is charmed for 10 minutes. While charmed in this way the user cannot move and must use their entire turn to play this instrument.
Upon playing this instrument the user makes a WIS 15 saving throw. Upon success, the user designates a number of creatures they can see equal to the user's Charisma modifier to be immune to the following effects:
All creatures that can hear this instrument have disadvantage on all attack rolls, ability checks, and saving throws. Any creatures that hear this instrument automatically lose concentration on any spell or magical effects that require concentration.
These effects end early if the user's charmed condition is ended.
If the user is immune to the charmed condition, it fails to trigger this item's magical properties.