Question: Who made their guest appearance first, The Dixie Chicks or Phil Hartman?

Context articles: Some Days You Gotta Dance
Court Yard Hounds
Dixie Chicks
Playlist: The Very Best of Dixie Chicks
An Evening with the Dixie Chicks
Protesting the Dixie Chicks
Marge vs. the Monorail
Travelin' Soldier
Papa Don't Leech
The Essential Dixie Chicks

"Some Days You Gotta Dance" is a song written by Troy Johnson and Marshall Morgan, and recorded by American country music group Dixie Chicks.
 It was released in September 2001 as the eighth and final single from their album "Fly".
 The song peaked at #7 on the "Billboard" Hot Country Singles & Tracks chart in March 2002.
 "Some Days You Gotta Dance" was previously recorded by Keith Urban's band, The Ranch, in 1997.
 Urban plays guitar on the Dixie Chicks' rendition.
Court Yard Hounds is an American country music and folk duo, founded by sisters Martie Maguire and Emily Robison.
 They, along with Natalie Maines, make up the Dixie Chicks.
 The sisters decided to record a side project under a different name.
 Court Yard Hounds, featuring Robison for the first time as lead vocalist, released a debut album for Columbia Records, the same label for which the Dixie Chicks has recorded, on May 4, 2010.
 The album debuted at No. 7 on the Billboard 200 chart, initially selling 61,000 copies.
 It has sold approximately 825,000 copies in the United States.
Dixie Chicks are an American country music band which has also crossed over into other genres, including pop and alternative country.
 The band is composed of founding members (and sisters) Martie Erwin Maguire and Emily Erwin Robison, and lead singer Natalie Maines.
 The band formed in 1990 in Dallas, Texas, and was originally composed of four women performing bluegrass and country music, busking and touring the bluegrass festival circuits and small venues for six years without attracting a major label.
 After the departure of one bandmate, the replacement of their lead singer, and a slight change in their repertoire, Dixie Chicks soon achieved commercial success, beginning in 1998 with hit songs "There's Your Trouble" and "Wide Open Spaces".
Playlist: The Very Best of Dixie Chicks is the greatest hits album from American country band the Dixie Chicks.
 The album consists of twelve songs personally selected by the Dixie Chicks from their fourth through seventh studio albums.
 It was released in the United States on June 1, 2010.
 The group supported the album by touring with The Eagles in 2010.
 It is a part of Sony BMG's "Playlist" series.
 It was also re-released on Sony's midprice sub-label Camden entitled "Wide Open Spaces: The Collection" in 2012.
An Evening with the Dixie Chicks is a 2002 live music documentary featuring the Dixie Chicks and directed by Joel Gallen.
 As of March 2003, An Evening with the Dixie Chicks has sold 2 million copies in the United States and has been certified 2x Platinum by the Recording Industry Association of America (RIAA).
Protesting the Dixie Chicks is a documentary by American filmmaker Christopher Fleeger, independently released on DVD in 2006.
 The film captures the storm of controversy ignited by the remarks of Natalie Maines, lead singer of the Texas pop-country trio the Dixie Chicks.
 On March 10, 2003, Natalie Maines, at a concert in London, stated that her group was "ashamed" to be from the same state as President George W. Bush.
 In the man-on-the-street style of "Heavy Metal Parking Lot", anonymous fans and protesters are interviewed outside the arenas of the Dixie Chicks 2003 USA tour, while the context of the drama is reenacted with toys and action figures of Natalie Maines, Toby Keith, General John Abizaid, Senator Richard Lugar, Senator John McCain and President George W. Bush.
"Marge vs. the Monorail" is the twelfth episode of "The Simpsons"' fourth season.
 It originally aired on the Fox network in the United States on January 14, 1993.
 The plot revolves around Springfield's impulse purchase of a faulty monorail from a conman.
 The episode was written by Conan O'Brien and directed by Rich Moore.
 Recurring guest star Phil Hartman provided the voice of Lyle Lanley, while the American actor Leonard Nimoy made a guest appearance in this episode.
"Travelin' Soldier" is a song written and originally recorded by American country music artist Bruce Robison in 1996 and again, in rewritten form, in 1999.
 It was later recorded by Ty England on his 1999 album, "Highways & Dance Halls".
 The first rendition to be issued as a single was by the Dixie Chicks in December 2002, from their album "Home".
 It became the group's sixth and final single to reach No. 1 on "Billboard" "Hot Country Singles & Tracks" (now "Hot Country Songs").
 A version of the song featuring Natalie Maines of the Dixie Chicks, Bruce Robison and Robison's wife, Kelly Willis, appears on "KGSR's Broadcasts Vol.
 13" album.
 Aaron Lewis also recorded a cover of the song as a duet with his daughter Zoe on his 2016 album "Sinner".
"Papa Don't Leech" is the sixteenth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.
 It originally aired on the Fox network in the United States on April 13, 2008.
 It features the return of Lurleen Lumpkin (voiced by special guest star Beverly D'Angelo) from the third season episode "Colonel Homer", after an absence of sixteen years (though she appeared in a few quick cameos on such episodes as "Marge vs. the Monorail" and "Team Homer").
 The Dixie Chicks also appear as themselves.
 It was written by Reid Harrison and directed by Chris Clements.
The Essential Dixie Chicks is a 2010 greatest hits album from American country music group the Dixie Chicks.
 The pair of discs contain thirty songs personally selected by the Dixie Chicks from their fourth through seventh studio albums.
 The album is a part of the Sony Music's "The Essential" series.
 The album was released in countries such as Canada, Australia, and New Zealand on August 24, 2010, and was released in the United States on October 26 of that year.