Question: What is the American animated television searies had Trey Parker as a director and has "Elementary School Musical" as one of its episodes?

Context articles: South Park (season 9)
Charleston Community Unit School District 1
List of South Park characters
South Park (season 12)
Chelmsford High School
North Boone Community Unit School District 200
South Park (season 10)
South Park (season 2)
Jasper County Community Unit School District 1
Elementary School Musical (South Park)

Season nine of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 9, 2005.
 The ninth season concluded after 14 episodes on December 7, 2005.
 All of the episodes in the ninth season were written and directed by Trey Parker.
Charleston Community Unit School District 1 is a unified school district based in Charleston, the county seat of Coles County, Illinois; it was created through the consolidation of the charter school district it was formed from and over sixty-seven other school districts in the area.
 Charleston Community Unit School District 1 is a conglomerate of six schools, with all but one located in Charleston itself: four elementary schools, one middle school, and one high school form the makeup of the district.
 Education begins at a prekindergarten level, and those living in the Charleston area attend Mark Twain Elementary School, which prepares early youth for schooling by taking them through prekindergarten and kindergarten under the supervision of principal Terry Diss.
 Students who live in the far east reaches of Coles County may attend Ashmore Elementary School, which is based in a northeasterly village by the same name; Ashmore's distance from the other schools permits it to educate a larger range of students for the sake of efficiency.
 The school educates students from kindergarten through grade four, and also runs a prekindergarten program.
 Ashmore is also governed by Terry Diss.
 Students who graduate from Mark Twain move onwards to Carl Sandburg Elementary School, which educates those in grades one, two, and three under principal Chad Burgett.
 At Jefferson Elementary School in Charleston, the student bodies from both Carl Sandburg Elementary School and Ashmore Elementary School are consolidated.
 Students from grades four through six are taught in the facility under the supervision of principal Deborah Poffinbarger.
 District students graduating from Jefferson are moved to Charleston Middle School, where they are taught as seventh and eighth graders; the school principal here is Sandy Wilson.
 The last branch of education that Charleston's school district can provide is the education of adolescents in the grades nine through twelve at Charleston High School, which is run by principal Trevor Doughty.
 The superintendent of the schools in the district as of the 2007-08 school year was Dr. William Hill, although is considered as an interim;lastly, the mascots of the district and its middle and high schools are the Trojans, while the mascot of Jefferson Elementary School is the bulldog.
"South Park" is an American animated television series created by Trey Parker and Matt Stone for the Comedy Central television network.
 The ongoing narrative revolves around four children, Stan Marsh, Kyle Broflovski, Eric Cartman and Kenny McCormick, and their bizarre adventures in and around the fictional and eponymous Colorado town.
 The town is also home to an assortment of characters who make frequent appearances in the show such as students and their family members, elementary school staff, and recurring characters.
The twelfth season of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 12, 2008.
 The twelfth season concluded after 14 episodes on November 19, 2008.
 "Saturday Night Live" cast member Bill Hader is credited as a consultant starting with this season.
 Parker was the director and writer in this twelfth season.
 Stone was also the writer on the third episode of the twelfth season.
Chelmsford High School is a public, coeducational high school founded in 1917.
 The current building is located in North Chelmsford, Massachusetts, United States, and was built in 1974.
 Before 1974 the high school was located in the current McCarthy Middle School building.
 It serves as the public high school for students in grades nine through 12.
 It is part of a central campus that includes four of the town's seven schools.
 The three other schools at the central campus are the C. Edith McCarthy Middle School, the Col. Moses S. Parker Middle School and the Charles D. Harrington Elementary School.
 The town's three other schools, located throughout the town, are the Byam Elementary School, the Center Elementary School and the South Row Elementary School.
 Chelmsford's fifth elementary school, Westlands School, closed in 2008 due to budgetary reasons.
North Boone Community Unit School District 200 is a unified school district based in the central region of the county of its namesake, Boone County; more specifically, in the village of Poplar Grove, Illinois.
 Five of the six schools in the district are located here, with the other being eastwards in the village of Capron.
 The community unit school district is composed of, as previously mentioned, six schools: there are three elementary schools, two middle schools, and one high school.
 Manchester Elementary School, which serves the grades K-4 alongside Poplar Grove Elementary School, is governed by Principal Kristi Crawford; the principal of Poplar Grove Elementary School is Sharon Olds.
 Capron Elementary School, the only school in the district located in a village other than Poplar Grove, serves not only the grades K-4, but also includes a prekindergarten program.
 The current principal is Matt Klett.
 All students who graduate from one of the district elementary schools will consolidate at the fifth grade in one school, called North Boone Upper Elementary School, whose principal is Mike Greenlee;all students move on to North Boone Middle School, headed by Jeremiah Auble, which educates those in grades seven and eight.
 The last leg of education this district can provide is to those from grade nine to grade twelve; the facility is called North Boone High School, whose principal is named Jacob Hubert.
 The current superintendent is Steven Baule.
 The mascot of the district high school is the Viking.
The tenth season of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 22, 2006.
 The tenth season concluded after 14 episodes on November 15, 2006.
 This is the first season in which Kenny does not die and the last season featuring Isaac Hayes (the voice of Chef) as Hayes quit the show following the backlash behind season nine's "Trapped in the Closet" episode.
 This season also had a minor controversy when the Halloween episode "Hell on Earth 2006" depicted "The Crocodile Hunter's" Steve Irwin with a stingray lodged in his chest getting thrown out of Satan's Halloween party for not being in costume.
 Episode 2 in this season is the last one with the Braniff Airlines logo.
 All the episodes in this season were written and directed by Trey Parker.
Season two of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on April 1, 1998.
 The second season concluded after 18 episodes on January 20, 1999; it remains the longest season of "South Park" to date.
 While most of the episodes were directed by series creator Trey Parker, Season 2 includes two episodes directed by Eric Stough.
Jasper County Community Unit School District 1 is a unified school district based in Jasper County's county seat of Newton, Illinois; it is the only school district in the county and is, consequently, the main educational body in all of Jasper County, although it serves portions of Effingham County and Cumberland County as well.
 This school district is composed of six schools in total; four elementary schools, one junior high school, and one high school.
 There is also a prekindergarten program run at the high school of the district should parents wish to enroll their children early.
 Willow Hill Elementary School, which is located in the village of its namesake, serves only kindergarteners; its proximity to the county seat and central position in the county allows its students to dawn from all parts of the county and still have easy access to the elementary school they will attend.
 The principal of Willow Hill is Dave Parker.
 Grove Elementary School is located in Island Grove, Illinois, the highest point of elevation in the county.
 Grove Elementary School educates students from kindergarten to grade six, and it runs a prekindergarten program as well.
 Craig Carr is the principal of this school.
 Ste. Marie Elementary School is located in the southern Jasper County village of Ste. Marie, and serves students in grades one through six.
 The principal of Ste. Marie is David Parker, the principal of Willow Hill Elementary School.
 Newton Elementary School is located in the county seat of Newton, and serves most of west Jasper County's first through sixth graders under principal Travis Wyatt.
 The latter three elementary schools feed into Jasper County Junior High School and are taught in the facility during seventh and eighth grade while being supervised by Newton Elementary School principal Travis Wyatt before graduating into Newton Community High School.
 Students in grades nine through twelve spend their last leg of precollegiate education at this school; their principal is Ruth Kerner.
 The district superintendent is Ron Alburtus, and the district's mascot is the eagle.
"Elementary School Musical" is the thirteenth episode of the twelfth season of the animated series "South Park", and the 180th episode of the series overall.
 It originally aired on Comedy Central in the United States on November 12, 2008.
 In the episode, a new boy at school helps set off an impromptu-singing-and-dancing craze that the boys vow to never go along with, dragging them down into the dregs of unpopularity.