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The start of Arcade Fire's latest outing last week also marked the start of one couple's engagement. 

During the band's concert in Mountain View, California, a fan in the front row decided to surprise his girlfriend by popping the question in the middle of the song "Neighborhood Number 1 (Tunnels)."  And once Arcade Fire frontman Win Butler realized what was going on, he smiled and lent the guy his microphone just to make sure everyone knew that she said yes. 

Check it out below!