Question: What is the birthdate of this American musician, who sings with Alice in Chains on the album A Looking in View?

full_context: Document 1: A Looking in View: "A Looking in View" is a song by American metal band Alice in Chains, featured on their fourth studio album "Black Gives Way to Blue" (2009). It was released as the lead single from the album on June 30, 2009, marking it as the band's first single since the previous decade. The song was the band's first release with vocalist William DuVall, who replaced the band's original vocalist, Layne Staley. Clocking in at a length of seven minutes and six seconds, it is the longest song Alice in Chains has released as a single.
Document 2: Layne Staley: Layne Thomas Staley (born Layne Rutherford Staley, August 22, 1967 – April 5, 2002) was an American singer-songwriter who served as the lead vocalist of the rock band Alice in Chains, which he founded with guitarist Jerry Cantrell in Seattle, Washington, in 1987. Alice in Chains rose to international fame as part of the grunge movement of the early 1990s, driven partly by Staley's distinct vocal style, as well as the harmonized vocals between him and Cantrell.
Document 3: The Devil Put Dinosaurs Here: The Devil Put Dinosaurs Here is the fifth studio album by the American rock band Alice in Chains, released on May 28, 2013. It is the band's second reunion album. Following a worldwide tour in support of its previous album, "Black Gives Way to Blue" (2009), Alice in Chains began work on a new album. The making of "The Devil Put Dinosaurs Here" lasted for more than a year and the release of the album was delayed numerous times. The band entered the studio in July 2011 to start work on their fifth album. During the writing and recording sessions, guitarist Jerry Cantrell underwent shoulder surgery, which resulted in the delay of the album. The recording sessions of "The Devil Put Dinosaurs Here" were completed in December 2012.
Document 4: James Bergstrom: James Bergstrom is an American musician best known as the drummer for the band Second Coming. Before that, he played drums for the band Sleze (later renamed Alice N' Chains), which also featured future Alice in Chains vocalist Layne Staley.
Document 5: Dave Williams (singer): David Wayne Williams (February 29, 1972 – August 14, 2002) was an American vocalist best known as the lead singer for the heavy metal band Drowning Pool.
Document 6: The Stage (album): The Stage is the seventh studio album by American heavy metal band Avenged Sevenfold, released on October 28, 2016 by Capitol Records after a live stream event on the band's Facebook page. It's the first Avenged Sevenfold album to feature Brooks Wackerman on drums, who joined the band in late 2014 but wasn't revealed as Arin Ilejay's official replacement until Ilejay's departure in 2015, because the band wanted to find a drummer that would "fit in". "The Stage" is also the band's first album to be released through Capitol Records. It is also the band's longest studio album at 73 minutes and 35 seconds, thus beating "City of Evil" by almost a minute. The album also features their longest song to date, "Exist", with a run-time of 15 minutes and 41 seconds.
Document 7: William DuVall: William Bradley DuVall (born September 6, 1967) is an American musician, best known as being the current co-vocalist and a rhythm guitarist for the alternative metal band Alice in Chains replacing original vocalist Layne Staley, who died in 2002. DuVall joined Alice in Chains in 2006, and he appears on the 2009 album "Black Gives Way to Blue" as well as the 2013 follow-up "The Devil Put Dinosaurs Here".
Document 8: Layne Staley: Angry Chair: Layne Staley: Angry Chair is a biography by Adriana Rubio about Layne Staley, the lead vocalist of the rock band Alice in Chains, published in January 2003. As it is known, the book "Layne Staley: Angry Chair — A Look Inside the Heart and Soul of an Incredible Musician" written by Adriana Rubio (Argentinean journalist and a fan of Alice in Chains), features 50 pages of photos of Staley's art work, sketches, diary entries, and childhood pictures. It also contains an alleged last interview of Staley that Rubio claimed that she conducted less than three months before he died from an overdose of heroin and cocaine, in April 2002. Rubio did extensive interviews with Staley's mother, Nancy Layne McCallum, and his sister, Liz (née Elmer) Coats, to write the book. It is named after Alice in Chains' famous song, "Angry Chair".
Document 9: Mad Season (band): Mad Season was an American rock supergroup formed in Seattle, Washington in 1994 by members of three popular Seattle-based bands: Alice in Chains, Pearl Jam and Screaming Trees. Mad Season released only one album, "Above", and is best known for the single "River of Deceit". The band went on a semi-permanent hiatus in 1996 due to the band members' conflicting schedules and vocalist Layne Staley's problems with substance abuse. Attempts were made in the late 1990s to revive the group without Staley; however, the band dissolved following the death of bassist John Baker Saunders in 1999. Staley died three years later of a drug overdose.
Document 10: Black Gives Way to Blue: Black Gives Way to Blue is the fourth studio album by the American rock band Alice in Chains, released in September 29, 2009. It is their first record without singer Layne Staley, who died in 2002. It instead features new vocalist and rhythm guitarist William DuVall. It is the first Alice in Chains album released on Virgin Records and their first venture away from Columbia, who handled all of their previous releases. The album debuted at No. 5 on the "Billboard" 200, and was certified gold by the RIAA on May 26, 2010, with shipments exceeding 500,000 copies and has sold 1 million copies worldwide. The singles ""Check My Brain"" and ""Your Decision"" reached No. 1 on Billboard's Mainstream Rock Tracks, while ""Lesson Learned"" reached No. 4. ""Check My Brain"" was also the band's first #1 song on the Alternative Songs chart, and on the Hot Rock Songs chart, and it also reached No. 92 on Billboard's Hot 100, becoming the band's first single to appear on the chart.
Document 11: Grind (song): "Grind" is a song by American rock band Alice in Chains and the lead single from their album "Alice in Chains" (1995). It serves as the opening track to the album but, despite being its first single, did not experience the radio longevity of some of its contemporaries. The song was included on the compilation albums "" (1999), "Music Bank" (1999), "Greatest Hits" (2001), and "The Essential Alice in Chains" (2006). Jerry Cantrell sings lead vocals on the song with Layne Staley harmonizing with him.
Document 12: List of songs recorded by Alice in Chains: Alice in Chains is an American rock band formed in Seattle, Washington, in 1987 by guitarist and songwriter Jerry Cantrell and original lead vocalist Layne Staley.  The initial lineup was rounded out by drummer Sean Kinney and bassist Mike Starr, who was replaced in 1993 by Mike Inez.  Although never officially disbanding, Alice in Chains was plagued by extended inactivity from 1996 onwards due to Staley's substance abuse, which resulted in his death in 2002.  The band reunited in 2005 for a live benefit show and toured in 2006 with William DuVall taking over as lead vocalist full-time.  They have thence resumed releasing music.
Document 13: Over Now: "Over Now" is a song by the American rock band Alice in Chains, released on their album "Alice in Chains" (1995). It was a single from the band's "MTV Unplugged" performance, and was used to close the televised broadcast. The B-Side consists of the original studio version of the song. This is the second longest song that Alice in Chains has released as a single, behind "A Looking in View".
Document 14: The Black (Asking Alexandria album): The Black is the fourth studio album by English rock band Asking Alexandria. It was released on 25 March 2016, and is their first and only album to feature second lead vocalist Denis Stoff, who replaced original lead vocalist Danny Worsnop. Worsnop returned to the band in October of 2016. The album was preceded by the singles "I Won't Give In" released on 26 May 2015, "Undivided" released on 25 September 2015, and the album's eponymous track "The Black" released on 2 February 2016. The first song on the album, "Let It Sleep", was released on 3 March 2016, with a music video for the track being released the following day.
Document 15: Alice in Chains (album): Alice in Chains (occasionally informally referred to as The Dog Album, The Dog Record, and Tripod) is the self-titled third studio album by the American rock band Alice in Chains. It was released on November 7, 1995, and was the follow-up to the highly successful "Dirt". As with their previous releases, the album's songs focus on heavy subject matter such as depression, isolation, drug use, anger and death. The band relies less on metallic riffs and more on melody and texturally varied arrangements, integrating some of the more delicate acoustic moods of their EPs. However, the riffs are mostly down-tuned and atonal, employing a strong doom metal vibe.
ground_truth: September 6, 1967