Tegan & Sara hopped by The Late Show With David Letterman last night to perform their jubilant single "Closer." Watch it below. [videoembed size="full_width" alignment="center"][/videoembed] The band also revealed Hearththrob's tracklist: 01 Closer 02 Goodbye, Goodbye 03 I Was A Fool 04 I’m Not Your Hero 05 Drove Me Wild 06 How Come You Don’t Want Me 07 I Couldn’t ...