Final answer:
The ancient Greeks believed that the unique musical styles of each regional tribe represented the characteristics of that tribe.
Step-by-step explanation:
The statement that the ancient Greeks believed that the unique musical styles of each regional tribe represented the characteristics of that tribe is True. Music was an important part of ancient Greek culture and was believed to reflect the identity and character of different tribes.
For example, the ancient Greeks associated certain musical modes, or scales, with specific emotional qualities. This belief in the connection between music and cultural identity can be seen in various ancient Greek texts and historical accounts.