Mercury Rev were an indie-rock band from my pre-Student years. I seem to remember a mix of shoegazing plus harder guitar - but the memory is a funny thing.
Can't help you with Arcade Fire but Mercury Rev's 1998 album 'Deserters Songs' was mighty fine. How bad can something that uses mellotron and flugelhorn be?!
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For all such queries I tend to use http://www.allmusic.com/
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