i don't know this show was aired in America but I certainly was in Australia and when i was little my mum said I loved this show and that I liked the theme song. i still love the theme song.
BTW the song isn't actually made by the TV show, it's a song called "Believe in yourself" By "Ziggy Marley". never heard of that guy but it doesn't matter.
[ame="http://www.youtube.com/watch?v=b53WaK71sMM"]YouTube- Arthur theme song (full length)[/ame]