Every December, musicians are beset by a case of anxiety — an anxiety that they subsequently push down into the bottoms of their stomachs with the help of a healthy douse of aloofness. And from whence does that anxiety spring? The ubiquitous glut of “Best of 2011″ lists, of course. Well, this year we decided to turn the tables, allowing musicians to play critic and choose their favorite music and tech innovations of 2011. Antacids sold separately.