NEW YORK (TheWrap.com) – Jerry Nelson, a master of voices and puppetering who voiced Muppets including Count von Count during more than 40 years with “Sesame Street,” has died. He was 78. Also a musician and actor, he took part in dozens of Muppet projects, from the 1971 TV movie “Tales From Muppetland: The Frog Prince,” to 1979’s “The Muppet Movie,” to the 1980s series “Fraggle Rock,” to last year’s “The Muppets.” Nelson joined “Sesame Street,” which debuted in 1969, early in the show’s run. He soon took on major characters including The Count, Mr. Snuffleupagus, and Sherlock Hemlock. …