Name the Artist: A Natural Man?

Questions

What is plastic and coated with a film of magnetic iron oxide one ten thousandth of an inch thick?

Who sailed from Spain in the Santa Maria in 1492?

Which football team won the First Division Championship in the 1970s but is now in the lower divisions?

What instrument introduces Rhapsody in Blue?

In which science would you expect to come across the Witch of Agnesi?