Open Music Theory is an open-source, interactive, online “text”book for college-level music theory courses.

I like it :)

Recently, I begin learn JS, but when I find this article, I feel I cannot understand this language completely, lol

I read this article in several years ago, but I never add it in my bookmarks. It should be in this folder.

A good illustration of infinity.

I am really not good at it, when I study it on college.

It cost an arm and a leg, because portrait painters used to charge more for larger paintings and that a head and shoulders painting was the cheapest option, followed in price by one which included arms and finally the top of the range ‘legs and all’ portrait.