The Black Keys - Tighten Up - Black Keys played Letterman last night, and they sounded great.  I’m trying not to hyperbolize, but seriously, this album is great; and this song shines live and on the album.  The bridge of the song totally floors me, its such an interesting change of pace to the song.  Love this song / album / band.  Hope no one has slept on these guys, they are for real.