What is the theme song for the children's Arthur show on PBS?

I actually looked the song up, and I found it harder to find the name of Author's theme song. I found something that might be useful from the PBS website... there's no title it's called “Theme Song“. LOL! Hope this was helpful.

Click it♥

Arthur . Games . The Arthur Theme Song | PBS Kids (http://pbskids.org/arthur/games/songbook/theme.html)

I ALWAYS CALLED THE SONG "HEY"