Question: From which country hail the rock band 'Sick Puppies' who produced the album 'Tri-Polar' and the electronic music duo 'Empire of the Sun' whose albums include 'Walking on a Dream'?
Sentence (from "Empire of the Sun (band)"): Their 2008 debut album "Walking on a Dream" brought the duo international success and has been certified double platinum in Australia and gold in the United Kingdom.
Relevant evidence: Yes