Changes to the drum’s design altered its sound and meaning.

Evidence

This thinning would materially change the sound of the drum, evidence that although it might continue to be used for its original purpose of music-making or calling people to arms, it would now do so with a different voice. — Neil MacGregor, A History of the World in 100 Objects, 1432

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 1432