Snail Mail (aka Lindsey Jordan) made her live debut network TV last night, performing the title track of her just-released album ‘Valentine’ on The Late Show With Stephen Colbert – check it out below.Strumming up a storm on a red Gibson SG à la AC/DC’s Angus Young, Jordan appeared on the show with her four-piece band, delivering a rendition of ‘Valentine’ that, while faithful to the version that leads Jordan’s second full-length effort (as both its opening track and lead single), benefits from