The #4/b5 was also banned from all church music at one point. It was called the "devil's interval" or something like that because it sounds very evil. I believe it started being used again once some no name guy named..... dang, what was his name again...... oh yeah, J. S. Bach started using it....

The "no name" part being sarcasm of course, and I am pretty sure all of that information is correct. Cheers.

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