I was looking up on Toon Tracker's website that there was a song called the "Mickey Mouse March" was sung by the Pussycats (not to be mentioned as Josie and the Pussycats).:) It was a doo-wop song and it was from the "Mickey Mouse Club". If you want to listen to this doo-wop version of the theme song, here it is:

"Mickey Mouse March" by the Pussycats (http://www.toontracker.com/demented/mmclub.ram)