Misc: At what atoll in the South Pacific did the U S do bomb nuclear bomb test in 1946?

Questions

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?

Which former members of Bob Dylans backing band had their first number one hit with Deeply Dippy?