"She Looks So Perfect" is so perfectly catchy you could play it on the bagpipes and not ruin it. Instead, 5SOS deliver an acoustic version, accented by handclaps and gutbucket drums. Guess what? It's perfect. The single is joined by three tracks not included on the group's chart-topping debut: "Heartache on the Big Screen" is jittery fun, while "The Only Reason" is what counts for a ballad for these frisky Australian exports: a slow-jam verse with a huge, crunchy chorus. 5SOS originally caught fire via viral video song covers, and they nod to their origins with a spirited rendition of The Romantics' "What I Like About You."