useless trivia: What Word Means: A Prussian Carp?

Questions

1980S group whose lead singer Stuart Adamson died in 2001?

1980S Group who had success with fields of Fire and chance?

Lyrics - I believe the sun should never set upon an argument (group + title)?

Darren Hayes is just 50% of Savage Garden, who makes up the other half?

Lyrics.. When you feel all alone and the world has turned its back on you (group + track)?