Pop Quiz

This is my standard quiz on pop music. Answers will be posted in a few days.

1. Who was the first white man to be named jazz vocalist of the year in DOWNBEAT  magazine?

2.  Which vocalist has had the most #1 hits in American history?

3.  Who was the singer on the best selling recording of all time in the United States?

4. Name the first singer who taped his radio show in advance, so he could edit it.

5. Which singer walked off his film set and wouldn't return until Louis Armstrong was granted his first movie billing?