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Blackfield is a collaborative music project by the English musician and founder of Porcupine Tree, Steven Wilson, and Israeli rock singer Aviv Geffen. Together, six albums have been released under the moniker. The first two records, Blackfield and Blackfield II, saw Geffen and Wilson working together as equal partners, while the third and fourth, Welcome to my DNA and Blackfield IV, saw Geffen take on a leading role, writing all but one track across both albums and providing a significantly increased share of lead vocals. Despite initially announcing his intention to leave the project in 2014, Wilson instead worked again as an equal partner on a fifth album, Blackfield V, which was released on 10 February 2017. A sixth record, For the Music, was released on 4 December 2020, with Geffen again taking a leading role.

Lunatic Soul is a progressive rock side-project, founded by Riverside vocalist and bass guitarist Mariusz Duda in 2008. Originally conceived to allow him to explore genres outside of rock, the project was described by Duda in 2014 as progressive, ambient, oriental and electronic. Lunatic Soul has released seven albums to date. The most recent album, Through Shaded Woods, was released on November 13, 2020, and has been described by Duda as 'more folky' than previous releases.

Storm Corrosion was a musical collaboration between Mikael Åkerfeldt of Swedish progressive metal band Opeth and Steven Wilson, an English solo artist and frontman of the progressive rock band Porcupine Tree. Åkerfeldt and Wilson began a longstanding musical partnership in 2001 when Wilson produced Opeth's fifth studio album Blackwater Park. The two began writing together for a new project in 2010, releasing their self-titled only studio album in 2012 through Roadrunner Records.

Indukti is a progressive metal band from Poland, founded in 1999. Their debut album, S.U.S.A.R., featured Mariusz Duda of the Polish band Riverside on vocals.

Antimatter, a UK dark rock band, is the solo project of longtime founding member Mick Moss. The project was originally a duo composed of founding member Duncan Patterson and Moss, being essentially an amalgamation of two solo projects working in tandem with each other, with each member writing and arranging their songs alone and compiling them in the studio later on to create an album. In this manner the pair released three albums together, Saviour, Lights Out and Planetary Confinement, after which Patterson left, in 2005, to start another band Íon. Moss continued Antimatter as an extension of his own timeline established throughout the first three discs, releasing the project's fourth album Leaving Eden in 2007. Moss followed with 'Live@An Club',, Alternative Matter, Fear of a Unique Identity, The Judas Table, "Too Late", Welcome To The Machine, Live Between The Earth & Clouds, and, most recently, Black Market Enlightenment in 2018.

Green Carnation is a Norwegian progressive metal band from Kristiansand, formed in 1990. Green Carnation's trend of music has continuously changed on every release one by one; from straight forward death metal in their demo, to death-doom, then a progressive doom metal sound, to an atmospheric gothic metal sound, to a melancholic hard rock sound and in 2006, went as far as to releasing an entirely acoustic album Acoustic Verses. The band released its first album in 14 years titled Leaves of Yesteryear on May 8, 2020, which marked a return to their earlier gothic progressive metal roots. A new single was composed, arranged, rehearsed and recorded during the COVID-19 pandemic, called "The World Without a View", and released digitally on December 18th 2020.

OSI is an American progressive rock band, originally formed by Fates Warning guitarist Jim Matheos in 2002. Chroma Key keyboardist and vocalist Kevin Moore is the only other full-time member of the band. The collaboration may be considered a studio project, as its members and contributors write and track most of their material independently, sharing and developing tracks long-distance, only coming together at the end of the process for mixing and additional tracking. The band's name is a reference to the Office of Strategic Influence, a short-lived American government agency formed in 2001 to support the War on Terror through propaganda. The band has featured a number of guest musicians on its albums, including Sean Malone, Steven Wilson, Mikael Akerfeldt, Joey Vera and Gavin Harrison.

Æon Spoke is an alternative rock band from Los Angeles. It was created by members of Cynic and former members of Death, Paul Masvidal and Sean Reinert, when they relocated from Miami to Los Angeles.

In 2005 the track, "Emmanuel", appeared in the film What the Bleep Do We Know!?. Two of their tracks, "Damaged" and "Transform" also appeared on the Warner Brothers television series Smallville and One Tree Hill respectively. Also another song by Æon Spoke, "I've Seen Those Eyes", appeared in the movie Cry Wolf.

When asked by Nikola Savić about the status of the band in 2012, Paul said:

It’s pretty much on hold, you know. I was just playing a bunch of it today at soundcheck, but I haven’t really been thinking about it too much. I mean, I’ve got a lot material that maybe at some point in time will be released, but I don’t know – it’s one of those things, it’s kind of there, lurking, but I don’t know when it will reappear.

Paatos is a Swedish rock band that was formed in 1999 by Reine Fiske and Stefan Dimle, Petronella Nettermalm, Ricard Nettermalm and Johan Wallen. Paatos is usually classified as progressive rock, albeit influenced by bands such as Portishead and Massive Attack.

Devin Garrett Townsend is a Canadian singer, songwriter, musician, and record producer. He founded extreme metal band Strapping Young Lad and was its primary songwriter, vocalist, and guitarist from 1994 to 2007. He has also had an extensive solo career and has released a total of 28 albums across all of his projects as of 2022.

Katatonia is a Swedish heavy metal band formed in Stockholm in 1991 by Jonas Renkse and Anders Nyström. The band started as a studio-only project for the duo, as an outlet for the band's love of death metal. Increasing popularity led them to add more band members for live performances, though outside of the band's founders, the lineup was a constantly changing, revolving door of musicians throughout the 1990s, notably including Mikael Åkerfeldt of the band Opeth for a period. After two death/doom albums, Dance of December Souls (1993) and Brave Murder Day (1996), problems with Renkse's vocal cords coupled with new musical influences led the band away from the screamed vocals of death metal to a more traditional, melodic form of heavy metal music.

Dream Theater is an American progressive metal band formed in 1985 under the name Majesty by John Petrucci, John Myung and Mike Portnoy while they attended Berklee College of Music in Boston, Massachusetts. They subsequently dropped out of their studies to concentrate further on the band that would eventually become Dream Theater. Their current lineup consists of Petrucci, Myung, vocalist James LaBrie, keyboardist Jordan Rudess and drummer Mike Mangini.

Anneke van Giersbergen (formerly Agua de Annique) was the solo project of the former The Gathering vocalist, Anneke van Giersbergen.

The project was announced on 5 June 2007, the same day that both The Gathering and Anneke van Giersbergen issued separate announcements that van Giersbergen would leave the band in August.

She and her new bandmates laid down some basic tracks for the first album at the Waterfront Studios in Rotterdam and recorded overdubs at The Void in Eindhoven, as well as in her own home studio. Several of these songs were made available on the band's official web site. A track, "Ice Water", has been said to feature a string arrangement by Jeffrey Fayman. Additional vocals for the track "Lost and Found" were done by Kristin Fjellseth, who also wrote the track "Sunken Soldiers Ball". Heleen de Witte is said to play flute on unspecified tracks while Timothy Conroy provides some trumpet work. They released their first album called Air at the end of 2007, mixed by Jon Anders Narum.

A Perfect Circle is an American rock band formed in Los Angeles, California in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan. A Perfect Circle has released four studio albums, the first three during the early 2000s: Mer de Noms, their debut album in 2000, and followed up by Thirteenth Step in 2003; then in 2004, Emotive—an album of radically re-worked cover songs. Shortly after Emotive's release, the band went on hiatus; Keenan returned to Tool and started up solo work under the band name Puscifer, while Howerdel released a solo album, Keep Telling Myself It's Alright, under the moniker Ashes Divide. Band activity was sporadic in the following years; the band reformed in 2010, and played live shows on and off between 2010 and 2013, but fell into inactivity after the release of their greatest hits album, Three Sixty, and a live album box set, A Perfect Circle Live: Featuring Stone and Echo in late 2013. The band reformed in 2017 to record a fourth album, Eat the Elephant, which was released on April 20, 2018.

The Rock Band Network in the music video game Rock Band 3 supports downloadable songs for the Xbox 360 and PlayStation 3 versions through the consoles' respective online services. The Rock Band Network Store became publicly available on March 4, 2010 for all Xbox 360 players in selected countries (US, Canada, UK, France, Italy, Germany, Spain, Sweden, and Singapore). Rock Band Network songs are available on the PlayStation 3 in five song intervals through their own Rock Band Network Store on April 22, 2010. Rock Band Network songs are exclusive to the Xbox 360 for 30 days, after which a selection of songs are made available on the PlayStation 3. No Rock Band Network 2.0 songs have been released for the Wii in accordance with the discontinued service of Rock Band Network 1.0 for the Wii.

Riverside are a Polish progressive rock band from Warsaw. They were founded in 2001 by friends Mariusz Duda, Piotr Grudziński, Piotr Kozieradzki and Jacek Melnicki, who shared a love for progressive rock and heavy metal, although Duda, the main lyricist and composer of the band, was originally a fan of electronic, ambient, experimental music, like Radiohead, Massive Attack, Dead Can Dance, Tangerine Dream, Peter Gabriel, and later on, prog rock like Pink Floyd, Rush, Marillion, as well as thrash metal. Riverside can be described as a blend of atmospheric rock and metal elements, resulting in a sound similar to that of Porcupine Tree, Pain of Salvation, and Dream Theater.

Gazpacho are an art rock band from Norway. The original core of the band consisted of Jan-Henrik Ohme (vocals), Jon-Arne Vilbo (guitars), and Thomas Andersen (keyboards, programming, production). They started making music together in 1996 and the band has since expanded with Mikael Krømer (violin, co-producer), Robert R Johansen (drums), and Kristian Torp (bass).

Gazpacho's music has been described by one critic as being "classical post-ambient nocturnal atmospheric neo-progressive folk world rock". Their music has been compared to A-ha, Radiohead, Marillion, and Porcupine Tree.

Childhood friends Jon-Arne Vilbo and Thomas Andersen had played together in a band called Delerium before, which in their own words "whittled away". After several years of separation, the two friends met again and started making music together again. Andersen had met Jan-Henrik Ohme through his work as radio commercial producer and brought him into the jam sessions, which laid the foundation for Gazpacho as it exists today.