Bonanza is an American western/cowboy television series starring Pernell Roberts, Lorne Greene, Dan Blocker, and Michael Landon, which aired on the NBC television network from September 12, 1959 until January 16, 1973. From 1964 through 1967, the show was #1 in the yearly Nielsen ratings. In terms of longevity, the show remains NBC’s second longest-running series, after Law & Order. Bonanza was also the first hour-long network television series filmed in color. The theme song for Bonanza is not in the public domain and has been edited out of these shows.

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