Because, you know, there's an annoying handful of "sounds" at the moment that everyone is using. For example,

James Vincent McMorrow’s ‘This Old Dark Machine’
http://www.youtube.com/watch?v=X4Bs4k5i5BQ

and

Fleet Foxes ‘Mykonos’
http://www.youtube.com/watch?v=DT-dxG4WWf4

Also Naked and Famous and anythign MGMT have done.

NOW YOU.