▁" Col lide " ▁and ▁why ▁she ▁chose ▁to ▁release ▁it ▁as ▁the ▁lead ▁single , ▁saying ▁ ▁" Col lide " ▁was ▁released ▁to ▁Australian ▁main stream ▁radio ▁on ▁ 2 2 ▁August ▁ 2 0 1 1 . ▁On ▁ 2 ▁September ▁ 2 0 1 1 , ▁" Col lide " ▁was ▁released ▁to ▁download ▁digit ally ▁via ▁i T unes ▁as ▁part ▁of ▁a ▁collection ▁of ▁the ▁original ▁song ▁as ▁well ▁as ▁rem ix es ▁by ▁Af ro jack , ▁C ah ill , ▁Alex ▁Ga ud ino ▁and ▁Jason ▁Ro oney , ▁in ▁Austria , ▁Ireland , ▁Italy , ▁Sweden , ▁Switzerland , ▁United ▁Kingdom ▁and ▁the ▁United ▁States . ▁In ▁Germany , ▁the ▁song ▁was ▁released ▁as ▁a ▁CD ▁single ▁on ▁ 1 6 ▁September ▁ 2 0 1 1 . ▁G lass heart ▁was ▁originally ▁set ▁to ▁be ▁released ▁in ▁November ▁ 2 0 1 1 ▁following ▁" Col lide ", ▁however ▁the ▁album ▁was ▁subsequently ▁pushed ▁back ▁several ▁times ▁into ▁early ▁ 2 0 1 2 , ▁then ▁Summer ▁ 2 0 1 2 , ▁before ▁sett ling ▁on ▁October ▁ 2 0 1 2 . ▁ ▁Sam pling ▁controvers y ▁ ▁So on ▁after ▁" Col lide " ▁premier ed , ▁the ▁song ▁received ▁compar isons ▁to ▁an ▁instrument al ▁dance ▁track ▁called ▁" P engu in " ▁by ▁Swedish ▁DJ ▁and ▁recorded ▁producer ▁Av ici i . ▁Av ici i ' s ▁" P engu in " ▁samples ▁the ▁instrument al ▁of ▁"