The akadinda is a Ugandan xylophone that is so large that three musicians play it at the same time. Traditionally the akadinda was an instrument o important in the Bagandan court that the King welcomed one trained masters to live in the Palace to provide music for the royals and exhaustively train apprentices.
There is also a Ugandan royal xylophone called the amadinda. How are they different? The East Africa Living Encyclopedia tells us. (Spoiler alert: one is big, the other is bigger.)