Udjudg

The udjudg was a special musical instrument played by the Zybahhod Yenyoni. They were uniquely suited to play it with their "Y"-shaped naso-facial openings.

Behind the scenes
The udjudg was created by Jennifer Kay, a Star Wars fan, for the backstory of her Zybahhod Yenyoni entry in the Design An Alien contest held in the Star Wars Galaxy Magazines and as such, exactly how canon the item is remains unclear.