One thing about taking on Ryan Adams as a biography subject, you don’t want to blow it because he’s published a couple of books himself — “Hello Sunshine” and “Infinity Blues,” both of which came out in 2009 (not quite as robust a display of productivity as his musical 2005, but pretty impressive nevertheless). And while neither book was unanimously acclaimed, they still established enough of a literary reputation for Ryan to land on a recent listicle about “10 Rockers With Serious Literary Cred.” Ryan comes in at No. 8, just behind Sonic Youth’s Lee Ranaldo and ahead of Fall Out Boy’s Pete Wentz. Patti Smith, Tom Waits and Nick Cave are all further on up the list, too. And fittingly, the top dog is Leonard Cohen.