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)"): The band is a collaboration between Luke Steele of alternative rock act The Sleepy Jackson, and Nick Littlemore of electronic dance outfit Pnau.
Relevant evidence: No