The Rod of Singing is a magical item usable by both Clerics and
Magic-Users, although neither class will appreciate its charms.
When discovered, the Rod behaves like some useful rod (pick one
from Greyhawk, or DMG), but between 5 and 30 minutes after
picking up this device, the magician or Cleric will begin to wave it as if
conducting an imaginary band, and will sing loudly and off-key. This
noise has a 2 in 6 chance per turn of attracting wandering monsters
and, if the monsters are intelligent, -1 the singer’s reaction dice (due to <-1 on 2d6? -10%?>
the poor music quality).

The rod prevents the casting of spells by interfering with speaking
and gesturing. It adheres magically to the hand and can be removed
only by a Remove Curse or Wish spell. The person under the rod’s
control will continue singing as long as he is conscious, and will resist
attempts to knock him out.
 
 

AD&&D

Magic Items

Rods

The Dragon #37

Dragon magazine