Question: "Treehouse of Horror" is the third episode of "The Simpsons"' which number season, and is the first episode to have the music composed by Alf Clausen, an American film and television composer?

Context articles: Alf Clausen
Treehouse of Horror XII
Go Simpsonic with The Simpsons
Treehouse of Horror XXII
Treehouse of Horror XIII
List of The Simpsons Treehouse of Horror episodes
Treehouse of Horror (The Simpsons episode)
The President Wore Pearls
Treehouse of Horror
The Simpsons Theme

Alf Heiberg Clausen (born March 28, 1941) is an American film and television composer.
 He is best known for his work scoring many episodes of "The Simpsons", of which he had been the sole composer between 1990 and 2017.
 Clausen has scored or orchestrated music for more than 30 films and television shows, including "Moonlighting", "The Naked Gun", "ALF" and "Ferris Bueller's Day Off".
“Treehouse of Horror XII” is the first episode of "The Simpsons"' thirteenth season.
 Because of Fox’s contract with Major League Baseball’s World Series, the episode first aired on the Fox Network in the United States on November 6, 2001, nearly one week after Halloween.
 It is the twelfth annual "Treehouse of Horror" episode, consisting of three self-contained segments.
 In the first segment, a gypsy puts a curse on Homer, which puts everybody he cares about in danger.
 In the second segment, which is a parody on both "" and "Demon Seed", the Simpson family buys a new house, who falls in love with Marge and attempts to kill Homer.
 In the third and final segment, which lampoons the "Harry Potter" franchise, Lord Montymort attempts to capture Lisa, a skilled magician, in order to drain her magic powers.
Go Simpsonic with The Simpsons is the 1999 soundtrack album from "The Simpsons".
 It takes many of the musical numbers from the series which were either not included in the previous album, "Songs in the Key of Springfield", or were created since the previous album's release.
 The album has 53 tracks, most of which were written by Alf Clausen.
 It was well received by critics, being named the Best Compilation Album of 1999 by Soundtrack.net, and charted at number 197 on the "Billboard" 200.
"Treehouse of Horror XXII" is the third episode of the twenty-third season and the twenty-second Halloween episode of the American animated sitcom "The Simpsons".
 It originally aired on the Fox network in the United States on October 30, 2011.
 The episode is part of the "Treehouse of Horror" series, which is an episode divided into three separate stories and an opening that is a parody of scary or Halloween themed stories.
 This episode's stories were primarily spoofs of the French film "The Diving Bell and the Butterfly", the television series "Dexter", and the American film "Avatar".
 The opening was a parody of the autobiographical film "127 Hours", in which the subject Aron Ralston loses an arm.
"Treehouse of Horror XIII" is the first episode of "The Simpsons"<nowiki>'</nowiki> fourteenth season and the thirteenth Halloween episode.
 It first aired on the Fox network in the United States on November 3, 2002, three days after Halloween.
 It is the second Treehouse of Horror to have a zombie related segment, and the last Treehouse of Horror to have three separate writers credited for writing three stories (starting with "Treehouse of Horror XIV", only one writer is credited for writing the three stories).
This is a list of "Treehouse of Horror" episodes produced by the animated television series "The Simpsons".
 "Treehouse of Horror" episodes have aired annually since the second season (1990) and each episode has three separate segments.
 These segments usually involve the family in some horror, science fiction, or supernatural setting and always take place outside the normal continuity of the show and are therefore considered to be non-canon. "
Treehouse of Horror" episode aired on October 25, 1990 and was inspired by EC Comics Horror tales.
 Before "Treehouse of Horror XI", which aired in 2000, every episode has aired in the week preceding or on October 31; "Treehouse of Horror II" and "Treehouse of Horror X" are the only episodes to air on Halloween.
 Between 2000 and 2011, due to Fox's contract with Major League Baseball's World Series, several episodes have originally aired in November; as of 2011 every "Treehouse of Horror" episode has aired during the month of October.
 From "Treehouse of Horror" to "Treehouse of Horror XIII", all three segments were written by different writers and in some cases there was a fourth writer that wrote the opening and wraparound segments.
 For "Treehouse of Horror", there were even three different directors for the episode.
 Starting with season fifteen's "Treehouse of Horror XIV", only one writer was credited as having written a "Treehouse of Horror" episode, and the trend has continued since.
"Treehouse of Horror" is the third episode of "The Simpsons"<nowiki>'</nowiki> second season.
 It originally aired on the Fox network in the United States on October 25, 1990.
 The episode was inspired by 1950s horror comics, and begins with a disclaimer that it may be too scary for children.
 It is the first Treehouse of Horror episode.
 These episodes do not obey the show's rule of realism and are not treated as canon.
 The opening disclaimer and a panning shot through a cemetery with humorous tombstones were features that were used sporadically in the "Treehouse of Horror" series and eventually dropped.
 This is also the first episode to have the music composed by Alf Clausen, taking over for Danny Elfman who also wrote the show's theme.
"The President Wore Pearls" is the third episode of "The Simpsons"<nowiki>'</nowiki> fifteenth season.
 It first aired on the Fox network in the United States on November 16, 2003.
 The episode was nominated for an Emmy for Outstanding Music (by Alf Clausen) And Lyrics (by Dana Gould).
Treehouse of Horror, also known as "The Simpsons" Halloween specials, is a series of Halloween specials within the animated series "The Simpsons", each consisting of three separate, self-contained segments.
 These segments usually involve the Simpson family in some horror, science fiction, or supernatural setting.
 They take place outside the show's normal continuity and completely abandon any pretense of being realistic, being known for their far more violent and much darker nature than an average "Simpsons" episode.
 The first, entitled "Treehouse of Horror", aired on October 25, 1990, as part of the second season and was inspired by EC Comics horror tales.
 Since then, there have been 26 other "Treehouse of Horror" episodes, with one airing every year.
"The Simpsons" Theme", also referred to as "The Simpsons" Main Title Theme" in album releases, is the theme music of the animated television series "The Simpsons".
 It plays during the opening sequence and was composed by Danny Elfman in 1989, after series creator Matt Groening approached him requesting a retro-style theme.
 The piece, which took 3 days, 2 hours, 48 minutes, and 19 seconds to create, has been noted by Elfman as the most popular of his career.
 The theme, as used for the opening sequence, was re-arranged during season 2, and the current arrangement by Alf Clausen was introduced at the beginning of the third season.