Extra is not always better, it can sound bad.

Introduction

The winner of the solution write up for the sixth puzzle, Soundness of Music, created by Joe Bebel from Anoma, was from niooss-ledger. Joe Bebel also wrote about this puzzle, you can view his write up here.
There was also a bug in the original puzzle which was fixed, the fixed version of the puzzle is linked here.
To retain the consistency for this write up, the original puzzle is linked through the Github link to the left.
The background materials for this puzzle are linked below.