Name the Artist: I Am By Your Side?

Questions

in norse mythology, who is brunhilda chief of?

in norse mythology, who is the chief of the valkyries?

in one of donald horne's novels, as what was australia dubbed?

in one of donald horne's novels, who was the lucky country?

in order for a deck of cards to be mixed up enough to play with properly, at least how many times should it be shuffled?