Pantera was an American heavy metal band from Arlington, Texas.
 The group was formed in 1981 by the Abbott brothers – drummer Vinnie Paul and guitarist Dimebag Darrell – along with lead vocalist Terry Glaze.
 Bassist Rex Brown joined the band the following year, replacing Tommy D. Bradford, who was the unofficial original.
 Having started as a glam metal band, Pantera released four albums during the 1980s.
 Looking for a new and heavier sound, Pantera replaced Glaze with Phil Anselmo in late 1986 and released "Power Metal" in 1988.
 With its fifth album, 1990's "Cowboys from Hell", Pantera introduced a groove metal sound.
 Pantera's sixth album, 1992's "Vulgar Display of Power", exhibited an even heavier sound. "
Far Beyond Driven" (1994) debuted at number one on the "Billboard" 200.
Wolverine Blues is the third studio album by Swedish death metal band Entombed, released on October 4, 1993 by Earache Records.
 The album displays a completely different sound from previous releases, combining elements of hard rock, heavy metal, and hardcore while still retaining much of their traditional, death metal roots, in a style that would later be known as death 'n' roll.
 The band also adopted a mid-tempo groove metal style for this release, similar to that of American heavy metal band Pantera.
Just Me is the ninth studio album from R&B singer/songwriter Keith Sweat.
 Released on May 13, 2008 through Atco Records, it is the follow-up album to 2002's "Rebirth", and is Sweat's first album after having signed with Atco Records.
 It is his first R&B album in ten years to top the Top R&B/Hip-Hop Albums chart (the sixth #1 R&B album from Sweat overall).
Chaos A.D. is the fifth studio album by Brazilian heavy metal band Sepultura, released on October 19, 1993, by Roadrunner Records.
 Although the album is considered thrash metal, it saw a stylistic departure from the band's earlier style, by incorporating a new groove metal sound.
War of Words is the debut studio album by English-American heavy metal band Fight, released on September 14, 1993 by Epic Records.
 This is the first release Rob Halford recorded after his departure from Judas Priest in 1992.
 He brought with him drummer Scott Travis from the band and recruited three new members.
 The music is a mixture between the heavy metal sound created by Judas Priest and a thrash/groove sound similar to that of Pantera.
 Halford is also credited with playing guitar but only recorded vocals for the album.
Metal Magic is the debut studio album by American heavy metal band Pantera, released on June 10, 1983 by Metal Magic Records.
 Like the band's next three releases, this album is musically oriented toward a glam/heavy metal sound influenced by Kiss and Van Halen, rather than the groove metal style they became famous for playing in the 1990s, starting with the release of "Cowboys from Hell".
 It was released on the band's own label (also called Metal Magic) and produced by Jerry Abbott (under the alias "The Eldn'"), a noted country music songwriter and producer, and father of Dimebag Darrell and Vinnie Paul, who were sixteen and nineteen years old, respectively, at the time of release.
Cowboys from Hell is the fifth studio album and major label debut by American heavy metal band Pantera, released on July 24, 1990 by Atco Records.
Vulgar Display of Power is the sixth studio album by the American heavy metal band Pantera, released on February 25, 1992 through Atco Records.
 One of the most influential heavy metal albums of the 1990s, "Vulgar Display of Power" has been described as "one of the defining albums of the groove-metal genre".
 Several songs from this release have become some of the band's best known, such as "Mouth for War", "A New Level", "Walk", "Fucking Hostile", and "This Love".
Groove metal (also known as post-thrash or neo-thrash) is a subgenre of heavy metal music.
 It is often used to describe Pantera, Exhorder and Machine Head.
 At its core, groove metal takes the intensity and sonic qualities of thrash metal and plays them at mid-tempo, with most bands making only occasional forays into fast tempo.
Independent is the third studio album by American thrash metal band Sacred Reich, released in 1993 by Metal Blade and Hollywood Records.
 This album is considered to be a slight departure from the band's early thrash metal style heard on their previous releases, with the band incorporating a more groove metal sound.

Question: On what date did Atco Records release the album where Pantera introduced a groove metal sound?
Answer: July 24, 1990