
Lassie is an American television series that follows the adventures of a female Rough Collie dog named Lassie and her companions, both human and animal. The show was the creation of producer Robert Maxwell and animal trainer Rudd Weatherwax and was televised from September 12, 1954, to March 25, 1973. The seventh longest-running U.S. primetime television series after The Simpsons, Law & Order: Special Victims Unit, Gunsmoke, Law & Order, Family Guy and NCIS, the show ran for 17 seasons on CBS before entering first-run syndication for its final two seasons. Initially filmed in black and white, the show transitioned to color in 1965.
Production
Narration
Wrather's wife, Bonita Granville Wrather, who was the series' associate producer, narrated numerous episodes throughout the run of the series, usually the beginning and/or ending of multi-part episodes.[1]
Writers
Many early episodes were written by Robert Maxwell under the pseudonym Claire Kennedy.[2] In later years, the writing partnership of Robert Schaefer and Eric Freiwald was responsible for over 150 episodes. They were also responsible for developing the idea of having Lassie with a forest ranger.[3]

Theme music
Lassie used several pieces of theme music during its long broadcast history. For the first season, "Secret of the Silent Hills (Theme from the Lassie TV series)", is used for both the opening and ending theme. Composed by William Lava, the orchestral theme was originally created for the 1940 radio show The Courageous Dr. Christian.[4]
For the second and third season a variation of this theme, titled simply "Lassie Main & End Title", was used for the opening and ending theme. Raoul Kraushaar, the music director for the series, is the listed composer for the theme; however the changes he made to the original are so slight that only a trained ear can tell the difference. The third theme used for the series is an orchestral rendition of the aria, "Dio Possente" (Even Bravest Hearts May Swell) from Charles Gounod's opera, Faust. The exact time this theme started being used is uncertain due to conflicting records; however it is agreed that it was the third series, and was used for at least part of season four for the change of ownership of Lassie.[4]

The most famous of the Lassie theme songs appeared at the start of the fifth season. Copyrighted as "Lassie Main & End Title", the composer credit has never been definitively claimed to this day. The melody is whistled by Muzzy Marcellino. Nicknamed "The Whistler," it remained the series theme for the rest of the "Martin years". With the coming of the "Ranger years", the opening and ending theme was changed to an orchestral version of "The Whistler". Beginning in season 17 (where Lassie traveled alone), and continuing throughout the Holden Ranch era, the theme was changed again, this time to Nathan Scott's arrangement of the traditional folk tune Greensleeves, which became the series theme song for the rest of its run. For the final two seasons, the familiar closing visual of Lassie standing on a hill and lifting her paw, was replaced by the credits on a green background, and flashing from one slate to the other instead of scrolling as in most of the series run.[4] Television composer Nathan Scott scored the music to nearly every episode between 1963 and 1973,[5] except for four episodes.[6]