I unfortunately don't know much about architect scales. I tried to do research online, but I found no distinction between any of these scales. My best guess would either be a half or standard scale.
Answer:
the discrimination of the era kept it in this community
Explanation:
this is due to racism in the 19's, an example of this would be
white person: they took blues from us we dont like it anymore
aanother reason could also be that for african american people it was a way to show their emotion from racism
You forgot the rest of the question...
Answer:
Because of the number three was associated with embodiment and theological ideas such as the trinity