Great countdown, I really enjoyed it and wasn't too surprised at No 1. I'm now watching her 85 tour on Youtube - I was a massive fan but she's not actually a very good singer or dancer when you look back. That said she was incredibly cool and inspiring for a young teen, there was nobody like her - not in my small town world anyway. It's sad that she's felt the need to change so much over the years.
Top 3 Madonna songs? Mine would be Crazy for You, Like a Prayer and Into the Groove in no particular order.