Question: Are Tommy Karevik and Ben Gibbard both singers?

Context articles: Eureka Farm
One Fast Move or I'm Gone
Kamelot
Ben Gibbard
Silverthorn (album)
You Can Play These Songs with Chords
Tommy Karevik
Power Ballads (Aqueduct album)
Death Cab for Cutie
Know by Heart

Eureka Farm was a band from Bellingham, Washington.
 It began in 1996 with members Arman Bohn (songwriter/guitar), Ben Gibbard (drums), and Nick Harmer (bass).
 During this time the band went by the name "Shed".
 Gibbard left the band and was replaced by Jason McGerr (drums) in 1996.
 The band changed its name to "Eureka Farm" in 1997.
 Harmer was replaced by Chuck Keller (bass) in 1997, and Caspar Sonnet (keys, alto saxophone, and bass clarinet) joined in 1998.
One Fast Move or I'm Gone: Kerouac's Big Sur is an album by Ben Gibbard (Death Cab for Cutie) and Jay Farrar (Son Volt), released in 2009.
 The lyrics are based on the prose of Jack Kerouac's novel "Big Sur" (1962).
 "One Fast Move or I'm Gone" was a result of Gibbard's and Farrar's mutual appreciation for Kerouac's work while recording several songs for a feature-length documentary of the same name.
Kamelot is an American power metal band from Tampa, Florida, formed by Thomas Youngblood and Richard Warner in 1991.
 The Norwegian vocalist Roy Khan joined for the album "Siége Perilous", and shared songwriting credit with Youngblood until his departure in April 2011.
 On June 22, 2012, Youngblood announced on their website that their new vocalist is the Swedish singer Tommy Karevik, who was first featured on Kamelot's album "Silverthorn" as main vocalist, co-songwriter and lyricist.
Benjamin Gibbard (born August 11, 1976) is an American singer, songwriter and guitarist.
 He is best known as the lead vocalist and guitarist of the indie rock band Death Cab for Cutie, with which he has recorded eight studio albums, and as one half of the electronica duo the Postal Service.
 Gibbard released his debut solo album, "Former Lives", in 2012, and a collaborative studio album, "One Fast Move or I'm Gone" (2009), with Uncle Tupelo and Son Volt's Jay Farrar.
Silverthorn is the tenth studio album by the American power metal band Kamelot.
 The album was released on the Steamhammer label, a division of SPV, on October 2012 worldwide.
 It is the first album to feature Tommy Karevik as the lead singer and their third concept album, after "Epica" (2003) and "The Black Halo" (2005).
 The concept and story are original, and features a 19th-century little girl named Jolee, who dies in a tragic accident witnessed by her twin brothers.
 The story deals with how the girl's affluent family handles the tragic event, leading to cover-ups, secrets, and betrayal.
 The cover by Stefan Heilemann shows Jolee, the main character and angel of afterlife, as an adult.
You Can Play These Songs with Chords is an early demo from the rock band Death Cab for Cutie, which at the time consisted entirely of founder Ben Gibbard.
 This demo was originally released on cassette, and it proved so popular, Gibbard decided to recruit other members to make a full band, which would go on to record "Something About Airplanes", the band's debut studio album.
Tommy Karevik (born November 1, 1981) is a Swedish metal vocalist, best known as the singer for metal bands Seventh Wonder and Kamelot.
Power Ballads is the debut album by Aqueduct.
 It was recorded by Trent Bell at Bell Labs (Flaming Lips, Starlight Mints) and self-released on February 25, 2003.
 After releasing the album, frontman David Terry relocated to Seattle, Washington.
 Twelve hours after Terry's arrival in Seattle, Aqueduct opened for Modest Mouse.
 Ben Gibbard (of Death Cab For Cutie) subsequently recommended Aqueduct to Barsuk Records, who signed the band and released Pistols at Dawn in 2004.
Death Cab for Cutie is an American alternative rock band, formed in Bellingham, Washington in 1997.
 The band comprises Ben Gibbard (vocals, guitar, piano), Nick Harmer (bass), Dave Depper (guitar, keyboards, vocals), Zac Rae (keyboards, guitar), and Jason McGerr (drums).
 In 2014, founding guitarist and producer Chris Walla announced that he would be departing from the band after recording their eighth studio album, "Kintsugi".
Know by Heart is the American Analog Set's fourth studio album.
 It was released on September 4, 2001, and was their first album on Tiger Style Records.
 The song "The Postman" contains vocals by guest Ben Gibbard of Death Cab for Cutie and the Postal Service.
 Gibbard later covered the song "Choir Vandals" on Home Series Vol.
 V, a split EP with the American Analog Set's own Andrew Kenny.
 "Gone to Earth" first appeared on AmAnSet's 1996 album "The Fun of Watching Fireworks".
 "Aaron and Maria" was included in an issue of CMJ New Music Monthly in 2002.