Veteran singer-songwriter-actor Steve Earle and veteran actor-director Steve Buscemi are two people who would seem to have known each other for ages. Their work, whether it’s Earle’s vast catalog of songs (“Copperhead Road,” “Guitar Town”) and acting roles (“The Wire,” “Treme,” “Leaves of Grass”), or Buscemi’s formidable history of acting and directing (“Fargo,” “Reservoir Dogs,” “The Big Lebowski,” “The Sopranos,” “Boardwalk Empire”), shares a certain humanity, sensitivity and sensibilities. Yet the two actually met for the first time earlier this year, after Buscemi was suggested as a director for a new video for Earle’s 2007 song “City of Immigrants,” from his New York-themed album “Washington Square Serenade.” The video is a heartfelt, lively celebration of the polyglot melting pot that New York City has always been, created by two longtime residents.…