Bonethriven

The bonethriven was a wind instrument that could be found in mind flayer communities.

Description
The instrument consisted of a resonance chamber that was surrounded by an enormous assembly of tubes that were carved from the bones of thralls. It was played through an illithid blowing into the mouth piece while it used its tentacles and fingers in conjunction to open and close a dozen stops. A thivenist that became skilled enough to master the instrument was able elicit sounds so horrible that non-illithids who heard the music were affected negatively by it until the "music" stopped.

One location it is confirmed to have been regularly played at is the Spinal Tap in Oryndoll.