A half hour before the six o’clock start time of the monthly Folk Song Jam Along, there were already about a half dozen people in the program room at the Westgate Branch of the Ann Arbor District Library. Song leaders Lori Fithian and Jean Chorazyczewski greeted early arrivals at the door and chatted with familiar regulars. There were about fifty chairs facing the large pull-down screen at the front of the long rectangular room. Fithian had set her Mac laptop, complete with purple case, on the lectern on one side of the screen, and Chorazyczewski’s Yamaha electric keyboard rested on its stand near the other side.