Question: Who has more collaborated on more studio albums, Ihsahn or Ben Gibbard?

Context articles: Death Cab for Cutie discography
Ihsahn
Codes and Keys
Know by Heart
You Can Play These Songs with Chords
Life Is Full of Possibilities
ITunes Originals – Death Cab for Cutie
Ben Gibbard
April (Sun Kil Moon album)
Death Cab for Cutie

Death Cab for Cutie has released eight studio albums, five extended plays (EPs), a demo tape, a digital album, one live album, fifteen singles, nine music videos, and two DVDs. Death Cab for Cutie is an American indie rock group from Bellingham, Washington and was formed in 1997 by Ben Gibbard as a side project from Pinwheel.
 After releasing a demo tape, he added guitarist Chris Walla, bassist Nick Harmer, and drummer Nathan Good to the band.
 Death Cab signed to Barsuk Records and released four extended plays (EPs) and four studio albums through the label.
 The fourth album, "Transatlanticism", reached number 97 on the "Billboard" 200 and was eventually certified gold in the United States.
 The group also issued nine singles and a demo tape through Barsuk.
Ihsahn (born 10 October 1975 as Vegard Sverre Tveitan) is a Norwegian composer, multi-instrumentalist, and vocalist.
 He is best known for his work with Norwegian black metal band Emperor.
 He has appeared in Thou Shalt Suffer, played in Peccatum with his wife Ihriel (real name Heidi S. Tveitan), and now devotes himself to his solo albums.
Codes and Keys is the seventh studio album by Death Cab for Cutie, released on May 31, 2011.
 Ben Gibbard and Nick Harmer have both been quoted as saying that the album will be "a much less guitar-centric album than we've ever made before".
 The first single, "You Are a Tourist", was made available for online stream on March 28, 2011 on the band's official site and the album was available for streaming in its entirety on May 23, 2011 on NPR.
 The album debuted on "Billboard" 200 at No. 3, with 102,000 copies sold in its first week.
 It has sold 283,000 copies in the US as of March 2015.
 On November 30, 2011, the album received a Nomination in the 54th Grammy Awards for Best Alternative Music Album.
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.
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.
Life Is Full of Possibilities is the third studio album by electronic producer Dntel, released October 30, 2001 on the Plug Research record label.
 The album is notable for leading to the creation of The Postal Service, a result of the collaboration with Ben Gibbard on "(This Is) The Dream of Evan and Chan".
 A two disc "Deluxe Edition" of the album was released in 2011, which featured four additional songs not included on the initial release along with remixed versions of other songs from the album.
iTunes Originals – Death Cab for Cutie (2005) is an iTunes Originals release from the band Death Cab for Cutie.
 It features exclusive live studio versions of songs spanning Death Cab For Cutie's career, including "Underwater!"
, "Amputations", and "Soul Meets Body".
 It includes an interview with Ben Gibbard and Chris Walla and video footage from the recording session.
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.
April is the third studio album by American folk rock band Sun Kil Moon, released in the US on April 1, 2008 through Caldo Verde Records, and on April 18, 2008 in Japan via P-Vine Records.
 The album was recorded at Hyde Street Studios in San Francisco and Well Recording in Seattle during a seven-month stretch from spring to late summer in 2007.
 The album was produced and written by Mark Kozelek.
 Will Oldham, Ben Gibbard and Eric Pollard lend their backing vocals throughout the album.
 The album also comes with a bonus disc of 4 alternate recordings.
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".