LMFAO ‘Party Rock Anthem’ was the biggest selling song in Australia for 2011. Here is the complete list of the Top 100 ARIA singles for 2011: Singles: POS TITLE Artist 1 PARTY ROCK ANTHEM LMFAO Feat. Lauren Bennet & GoonRock 2 SOMEBODY THAT I USED TO KNOW Gotye Feat. Kimbra 3 MOVES LIKE JAGGER Maroon