Question: Are Mike Ness and Oliver Sykes both lead vocalists of their bands?

full_context: Document 1: Oliver Sykes: Oliver "Oli" Scott Sykes (born 20 November 1986) is an English musician, best known as the lead vocalist of the band Bring Me the Horizon. He also founded the apparel company Drop Dead clothing. Sykes has also created the graphic novel "Raised By Raptors" with Drop Dead Clothing artist Ben Ashton-Bell.
Document 2: Mike Ness: Michael James Ness (born April 3, 1962) is an American guitarist, vocalist, producer and chief songwriter for the punk rock band Social Distortion, which was formed in 1978. Mike Ness' songs are represented by Downtown Music Publishing.
Document 3: Vaughan Oliver: Vaughan Oliver (born 1957) is a British graphic designer based in Epsom, south of London. Oliver is most noted for his work with graphic design studios 23 Envelope and v23. Both studios maintained a close relationship with record label 4AD between 1982 and 1998 and were to give distinct visual identities for the 4AD releases by many bands, including Mojave 3, Lush, Cocteau Twins, Dead Can Dance, The Breeders, This Mortal Coil, Pale Saints, Pixies, and Throwing Muses. Outside of 4AD, Oliver has also done sleeve design for such artists as David Sylvian, The Golden Palominos, and Bush.
Document 4: Social Distortion Summer Tour 2013: The Social Distortion Summer Tour is a concert tour that will take place in 2013. Social Distortion will kick off the tour with two appearances at the Coachella Valley Music and Arts Festival on April 14 and 21. Some of the dates on the tour are rescheduled shows from fall 2012 that were cancelled due to Hurricane Sandy. The band will also make appearances at the annual Hootenanny at Oak Valley Ranch in California, their first as Social Distortion since 2007. Mike Ness made an appearance at the 2008 festival, but he was touring with his solo band. The band will also appear at the Free Press Summer Fest in Houston, Texas, and at this year's North by Northeast in Toronto.
Document 5: Dying Is Your Latest Fashion: Dying Is Your Latest Fashion is the debut studio album by American rock band Escape the Fate, released on October 3, 2006 on Epitaph Records. The origin of the album's title comes from a line in the chorus of the song "Situations". It contains nine new songs plus two songs taken from "There's No Sympathy for the Dead". "Not Good Enough for Truth In Cliché" and "Situations" were released as singles, with music videos being made for both. It is the only full-length album and second release with original singer and founding member Ronnie Radke. Ronnie would later be incarcerated and kicked out of the band. He is currently the frontman for Falling in Reverse. It is also the last release to feature rhythm guitarist Omar Espinosa and keyboardist Carson Allen (although he was no longer in at the time). As of 2014 drummer Robert Ortiz is the only member still with the band as both Monte Money and Max Green had recently left the band in 2013 and 2014 respectively. Mandy Murders, who had in the past dated Ronnie Radke, modeled for the cover art.
Document 6: Oliver &quot;Power&quot; Grant: Oliver "Power" Grant (born November 3, 1973) is an American entrepreneur, producer, and actor. He's a close associate of the hip hop group, Wu-Tang Clan. Grant was executive producer of all Wu-Tang Clan albums. He is the original founder and CEO of Wu Wear clothing (in 1995) and stores. He is also an older brother of Wu-Tang's affiliate Killarmy member Killa Sin.
Document 7: Social Distortion South American Tour: The Social Distortion South American Tour was a concert tour by Social Distortion. It was first announced on December 29, 2009. It would become Social Distortion's first time in South America in their entire career. Frontman Mike Ness had this to say:
Document 8: Under the Influences: Under the Influences, the second (and most recent) solo album from Social Distortion's Mike Ness, is a compilation of country, rock, and bluegrass covers released just six months after his first solo effort, "Cheating at Solitaire". As the title implies, Ness intends the album to be an illustration of the music that shaped him. Songs as diverse as "I Fought the Law" and "Wildwood Flower" make their appearance, each with Mike Ness's unique spin. Included is a honky tonk version of Social Distortion staple, "Ball and Chain".
Document 9: Social Distortion 2001 Tour: The Social Distortion 2001 Tour was a concert tour by Social Distortion. It was their first tour in three years as Mike Ness was busy with his solo project, touring throughout 1999 and the rest of the band was off doing their own thing. Dennis Danell was working as a producer in the Orange County area for up-and-coming punk bands and he was also in the process of recording demos for his side project. John Maurer had started his own side band as well, Foxy. Foxy had just released its debut album. On this tour, the band premiered new songs off of the Sex, Love and Rock 'n' Roll album like, "Footprints On My Ceiling", "I Wasn't Born to Follow" and "Angel's Wings" and "Road Zombie", although, "Angel's Wings" sounded almost different with different lyrics than its studio counterpart. They even played a couple songs that were rare to hear at a Social Distortion concert those days, "Hour of Darkness", "Backstreet Girl", "I Won't Run No More", "When She Begins", "King of Fools" and "Down On the World Again". This was also one of the few tours where Social Distortion did not have ANY opening acts.
Document 10: Social Distortion: Social Distortion is an American punk rock band formed in 1978 in Fullerton, California. The band currently consists of Mike Ness (lead vocals, lead guitar), Jonny Wickersham (rhythm guitar, backing vocals), Brent Harding (bass, backing vocals), David Hidalgo Jr. (drums), and David Kalish (keyboards).
Document 11: Antivist: "Antivist" is a song by British rock band Bring Me the Horizon. Written by vocalist Oliver Sykes, guitarist Lee Malia and keyboardist Jordan Fish, it was produced by Terry Date and featured on the band's 2013 fourth studio album "Sempiternal". Although it was not released as a single, the song is considered to be one of the band's most popular tracks, and it continues to be performed live on a regular basis.
Document 12: Fat Mike: Michael John Burkett (born January 31, 1967), also known as Fat Mike, is an American musician and producer. He is the bassist and lead vocalist for the punk rock band NOFX and the bassist for the punk rock supergroup cover band Me First and the Gimme Gimmes. He was also a temporary bassist for the band Against Me!
Document 13: List of Social Distortion band members: Social Distortion is an American punk rock band which currently consists of vocalist and guitarist Mike Ness, guitarist Jonny "2 Bags" Wickersham, bassist Brent Harding and drummer David Hidalgo Jr.. The band was formed in Fullerton, California in 1978, and originally comprised Ness, Rikk Agnew and his brother Frank on guitar, Casey Royer on drums, Tom Corvin on vocals and Mark Garrett on bass. The first lineup change took place in 1979, when Garrett was replaced by Dennis Danell, who had known Ness for years.
Document 14: Bring Me the Horizon discography: The discography of Bring Me the Horizon, a British rock band, consists of five studio albums, two live albums, one compilation album, one remix album, two extended plays (EPs), one demo album, 12 singles, two video albums, 23 music videos and one other appearance. Formed in Sheffield in 2004 by vocalist Oliver Sykes, guitarists Lee Malia and Curtis Ward, bassist Matt Kean and drummer Matt Nicholls, the band released their debut EP "This Is What the Edge of Your Seat Was Made For" on Thirty Days of Nights Records in 2005, which reached number number 41 on the UK Budget Albums Chart. After signing with British independent record label Visible Noise, the group released their debut full-length studio album "Count Your Blessings" in 2006, which reached the top 100 of the UK Albums Chart and the top ten of the UK Rock & Metal Albums Chart. The 2008 follow-up "Suicide Season" reached the UK top 50 and charted in the US for the first time when it reached number 107 on the "Billboard" 200. In November 2009 an expanded version of the album titled "Suicide Season Cut Up!" was released, featuring remixes and videos.
Document 15: Shepard Fairey: Frank Shepard Fairey (born February 15, 1970) is an American contemporary street artist, graphic designer, activist, illustrator and founder of OBEY Clothing who emerged from the skateboarding scene. He first became known for his "Andre the Giant Has a Posse" (…OBEY…) sticker campaign while attending the Rhode Island School of Design (RISD), which appropriated images from the comedic supermarket tabloid "Weekly World News".
ground_truth: yes