Question: What Band changed their lead vocalist to Natalie Maines on their fourth album?

Context paragraphs:
Court Yard Hounds: 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.

Wide Open Spaces: Wide Open Spaces is the fourth studio album and the major label debut of American country music band, the Dixie Chicks.  It was their first record with new lead vocalist Natalie Maines, and became their breakthrough commercial success.  It received diamond status by the RIAA on February 20, 2003 in the United States, having shipped 14 million units worldwide, while spending more than six years in the Australian ARIA music charts Country Top 20.

Dixie Chicks: 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".

Thank Heavens for Dale Evans: Thank Heavens for Dale Evans is the debut studio album by American country band the Dixie Chicks.  The group's original membership of Robin Lynn Macy, Laura Lynch, Martie Erwin, and Emily Erwin (whose names were changed to Martie Maguire and Emily Robison upon marriage), would survive intact for only this album and the following "Little Ol' Cowgirl", from 1989 to 1992, before first Macy, and then Lynch departed and the current vocalist, Natalie Maines assumed the vocalist position in 1995, creating the trio that became the highly successful band which found great fame in 1998 and remain popular with a large following to this day.

Protesting the Dixie Chicks: 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.

Accidents &amp; Accusations Tour: The Accidents & Accusations World Tour was a concert tour by the Dixie Chicks.  It was their first tour where tickets were sold after the scandal which ensued in 2003 when lead singer Natalie Maines publicly criticized President George W. Bush at Shepherd's Bush Empire in London during the Top of the World Tour, leading to intense criticism of the group.  Consequently, the level of commercial success for the tour attracted considerable media attention.  The tour was named after the lyrics in the song "Easy Silence" from the album "Taking the Long Way", released a few weeks earlier in 2006.

Sin Wagon: "Sin Wagon" is a song written by Natalie Maines, Emily Erwin, and Stephony Smith and recorded by the Dixie Chicks for their 1999 album "Fly".  Though never released as a single, it charted as an album cut and is one of the band's most popular songs to date.  It has been featured in five tours: Fly, Top of the World, Accidents & Accusations, Eagles with Dixie Chicks and the DCX MMXVI World Tour.

Not Ready to Make Nice: "Not Ready to Make Nice" is a song co-written and performed by American country music band Dixie Chicks.  It was released in June 2006 as the first single from the band's seventh studio album, "Taking the Long Way".  It remains the band's biggest hit in the US to date.  The song was written by Natalie Maines, Martie Maguire, Emily Robison, and Dan Wilson.

Natalie Maines: Natalie Louise Maines (born October 14, 1974) is an American singer-songwriter and activist who achieved success as the lead vocalist for the female alternative country band the Dixie Chicks.  Born in Lubbock, Texas, Maines considers herself a rebel who "loved not thinking in the way I knew the majority of people thought."

Mother (Natalie Maines album): Mother is the first solo studio album by American singer Natalie Maines, best known as the lead vocalist of the Dixie Chicks.  It was released on May 7, 2013.

Supporting paragraphs: Wide Open Spaces Natalie Maines
Answer: Dixie Chicks