It would be great if the site and PDFs used actual flat signs not "b"s. I keep reading "b"s as a “b” not a flat. It just takes that much longer to learn. Music flat sign is
keycode: Alt + 9837
HEX CODE ♭
HTML CODE ♭
HTML ENTITY ♭
Also, would be super awesome if the videos were all normalized to the same levels. The volume level between videos is sometimes quite drastic (listening through studio monitors).