AEW Collision's opening theme: ‘Saturday Night’s Alright For Fighting' by Elton John
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https://www.f4wonline.com/news/aew/aew-announces-elton-john-song-for-collision-opening-theme
https://www.f4wonline.com/news/aew/aew-announces-elton-john-song-for-collision-opening-theme
I haven't seen any indication of a new stage yet. Dynamite and Collision appear to be touring close enough cities that I suspect they'll use the same stage.