Glorious was originally released by Levy in 2007 and The Pierces have achieved both vital elements required for a good remake. Firstly the original track is relatively unknown, so they're bringing it to most peoples ears for the first time. Secondly they have found something within the song to build on and take it to another level. The best historic example of this is the Harry Nilsson arrangement of Without You, to the extent that Mariah Carey et al are covering the Nilsson release and not the Badfinger original, which otherwise would have remained an obscure album track.
With glorious harmonies and a great arrangement The Pierces are getting a song that deserves to be listened to heard. If you would like to see what I mean a link to the Levy original is attached.