Question: Dom & Roland is the alias of British drum and bass producer Dominic Angas and has released records on several labels including 31 Records, Prototype, and Renegade Hardware, and has collaborated with many people including Amon Tobin, who has released how many major studio albums under the London-based Ninja Tune record label?
Context: Supermodified is the fourth studio album by Brazilian electronic music producer Amon Tobin, and his third release on Ninja Tune.  The album is in some ways a departure from his previous releases as it manages to cover a wider variety of styles.  The album was Tobin's most commercially accessible release.  Video clips were made for "Four Ton Mantis" (directed by Floria Sigismondi) and "Slowly". Ghislain Poirier, often known simply as Poirier, is a Canadian DJ/producer from Montreal who is signed to the Ninja Tune record label.  He has, however, also worked with other labels such as Chocolate Industries, Rebondir, Shockout, Musique Large, Intr_version and 12k.  His work mainly consists of original instrumental mixes and mixes featuring Montreal hip hop MCs including Omnikrom, Face-T and Séba.  He also has collaborated with Beans, TTC, Lotek HiFi and Nik Myo.  He is noted for popular remixes of tracks of rock and hip hop artists such as Les Georges Leningrad, Clipse, Editors, Bonde do Rolê, Kid Sister, Pierre Lapointe, DJ Champion and Lady Sovereign.  Though he has worked in many different genres of electronic music, he is known for his eclectic taste in music and appreciation of tropical bass sounds. Dom & Roland is the alias of British drum and bass producer Dominic Angas.  The addition of "Roland" in the artist name refers to his Roland sampler.  In 1996 he was signed to Moving Shadow recordings, releasing three albums and numerous singles on the label.  He has released records on other labels including 31 Records, Prototype, and Renegade Hardware, and has collaborated with Kemal, Black Sun Empire, Noisia, Hive, Amon Tobin, Keaton, and Skynet. Two Fingers is the musical alter-ego of electronic musician Amon Tobin.  The first Two Fingers album was a collaboration with fellow electronic producer Doubleclick.  The eponymous release came out in 2009 on Paper Bag Records in North America and Big Dada in the United Kingdom.  The second album, "Stunt Rhythms", was a solo effort by Amon Tobin and was designed by Inventory Studio and released worldwide by Big Dada Recordings in 2012. The two producers, who first met when Tobin was living in Brighton, U.K., got together in Montreal in 2007 over a series of tracks that were partially an extension of their previous collaborations — exemplified by the dense, pummeling 2003 track "Ownage" — but in general a fundamentally new and dynamic direction incorporating visceral elements of dancehall, dubstep, and grime.  Following the singles "That Girl" and "What You Know," the group's self-titled debut was released in spring 2009, featuring vocals from dancehall star Ce'Cile, Ms. Jade, and, on seven of the album's 12 tracks, British rapper Sway. EBK is a drum and bass producer and DJ from London, England, with 10 years of releases on influential labels including Renegade Hardware and Dispatch Recordings. Eric San (born December 5, 1974), who records under the name Kid Koala, is a Canadian DJ, turntablist, musician and an author of graphic novels.  He is signed to the British record label Ninja Tune, is a member of alternative hip hop supergroup Deltron 3030, and The Slew with Dynamite D and former members of the Australian rock band Wolfmother, bassist and keyboardist Chris Ross and drummer Myles Heskett.  He has also made appearances with many other artists from Amon Tobin to the Preservation Hall Jazz Band and has made contributions to Lovage, Peeping Tom, Gorillaz and numerous other projects. Bricolage is a 1997 album by Brazilian electronic music artist Amon Tobin.  It was Tobin's second album, the first released under his own name, and his first on the Ninja Tune label.  The album was a departure from his first album, "Adventures in Foam" (as Cujo), incorporating a heavier blend of jazz melodies and intense jungle rhythms.  The album was followed by "Permutation" in 1998. Amon Adonai Santos de Araújo Tobin (born February 7, 1972), known as Amon Tobin, is a Brazilian musician, composer and producer of electronic music.  He is noted for his unusual methodology in sound design and music production.  He has released seven major studio albums under the London-based Ninja Tune record label. Adventures in Foam is the first album by Brazilian electronic musician Amon Tobin, and the only one to be released under the name Cujo (Portuguese for ""whose"").  It was first released in September 1996 on the small south London label Ninebar records.  This was around the same time that Tobin signed with Ninja Tune to record under his own name. Solid Steel Presents Amon Tobin: Recorded Live is an album by drum and bass artist Amon Tobin mixed live using the Final Scratch software.  It was recorded live, as the title suggests, in Melbourne, Australia during 2003 for Ninja Tune's Solid Steel radio series.  The European version of the album was first released in June 2004 and then the US version later in September.  Track listings vary on the US version.
Answer: seven