The term “raw talent” fits New York City singer-songwriter Jay Brannan to a “T.” He admits he knows little about the guitar, in fact he didn’t even know the names of the strings while writing most of his music. And yet, after just a few short years of open mic engagements and placement on the soundtrack of heralded indie film “Short Bus,” Brannan has been racing up the iTunes charts, with his new album goddamned breaking into the top 25 and now lingering in the top 100.