music: 90's Chart Toppers: Name The Artist: No Myth?

Questions

Which Wagner opera includes the Swan Chorus?

Which note does an orchestra tune to?

Which KC and the Sunshine Band song was a hit for KWS in the 90's?

Which Bruce Springsteen song won the 1993 original song Oscar?

Which band had 2 nuber one hits in Denmark before their home country of Sweden?