'Top of the Rock' recalls NBC's glory days

NBC is so buried in reality fare like America's Got Talent, Biggest Loser and Celebrity Apprentice right now that it can be difficult to recall the days when it was the No. 1 network, led by a string of "must-see" shows.

In his new book, former NBC entertainment president Warren Littlefield recalls what it was like during the network's heyday. Top of the Rock: Inside the Rise and Fall of Must See...