Fresh from blazing a trail across the East Coast with a sold-out tour in support of their latest EP, “Only Change is Permanent” as well as supporting American Juggernauts, Of Mice & Men — Sienna Skies are returning to the corners of Australia with “The Hardest Part” tour, a definitive nationwide stretch alongside US metal-core outfit, Of Virtue and Sydney based alt-rockers, Clay J Gladstone.