[matchagaucho]

A lot of work into visualization and media on that page. Impressive.

But a minor nit... I wish the publisher had done a more apples-to-apples comparison between 6/8 and 6/4.

3/4 is universally accepted to be a Waltz by composers and performers.

However, there's not much consensus in the 6 and 7 beat signatures whether the notes should be quarter or eighth notes.