Tonight, two weeks before their swing through Connecticut, Ray LaMontagne and the Pariah Dogs will appear on CBS&amp;#8217; &amp;#8220;Late Show with David Letterman.&amp;#8221; In addition to their performance on the show, which begins at 11:30 p.m., they also will perform an extended set for Live on Letterman, beginning at 8 p.m., that will be broadcast [...]