Question: Shaman was assembled from musicians who left what metal band?

Context paragraphs:
The Samans: The Samans (), is a Chinese Industrial metal band that was formed at 2007 in Changchun, Jilin.  Currently it has five members, Lifu Wang (Lead Vocal)、Yaxin Gao (Programme/Samples)、Zhichao Ren (Guitar)、Xiaoyu Cui (Guitar)、Ji Qi(Bass).  The name of their band is from their five members' (those who from Northeast of China and Inner Mongolia Region) Religion.  The member chose to use "The Samans" as their band's English name instead of "Shaman" because they insist it doesn't spell like that in their national language.  Most of their songs are in English.

Gandalf (Finnish band): Gandalf was a Finnish melodic death metal band who incorporated elements of traditional hard rock into their sound.  Formed in 1993 by drummer (then guitarist) Nalle Österman (later in Shaman, Korpiklaani and Lullacry), guitarist Timo Nyberg and vocalist Jari Hurskainen, with session drummer Mika "Gas Lipstick" Karppinen, who later achieved fame playing with the band HIM.  The name Gandalf came from when the founding fans of the band used to refer to Gandalf's guitarist as the guitar wizard, Gandalf (from The Lord of the Rings).  Since then, the band decided to call their band Gandalf.  Gandalf released both of their full-length albums through Wicked World Records, a subsidiary of Earache Records.

The Organization (band): The Organization was a heavy metal band formed in 1991 after the breakup of the thrash metal band Death Angel.  The band incorporated elements of metal, funk, and alt rock, releasing two albums in the early 1990s on Metal Blade Records.  The band included the original line-up of musicians from Death Angel minus singer Mark Osegueda who left the music business to go to college.  The Organization disbanded after bassist Dennis Pepa left the band in 1995.

Angra (band): Angra is a Brazilian metal band formed in 1991 that has gone through a number of line-up changes since its foundation.  They have released eight regular studio albums, five EPs and three live CD/DVDs to date.  Led by Rafael Bittencourt, the band has gained a degree of popularity in Japan and Europe.

Idja: Idja is the debut studio album by the Finnish folk metal band "Shaman", who later changed their name to "Korpiklaani".  The album was produced by Roope Latvala, best known as the guitarist of the Finnish metal bands Children of Bodom and Sinergy.

Shamániac: Shamániac is the second and final studio album by the Finnish folk metal band "Shaman", before they changed their name to "Korpiklaani".  The album has been produced by the Shaman frontman Jonne Järvelä and Samu Ruotsalainen, the drummer of the Finnish folk metal band Finntroll.

RituAlive: RituAlive is a live album and DVD, released in 2003 by the metal band Shaman.

Shaman (band): Shaman, previously known as Shaaman, was a Brazilian progressive/power metal band assembled in 2000 by three musicians who left the band Angra - Andre Matos, Luis Mariutti and Ricardo Confessori.  The band was completed with guitar player Hugo Mariutti (Luis' younger brother - both of them also play in another band called Henceforth).

Devolution (band): Devolution is a US based industrial metal band established by Mike Garrett, later recording under the pseudonym of Mykill Mayhem.  The first release from Devolution, entitled "Cerebrequiem", was in the genre of death metal and was released in 1996, featuring session musicians assembled from Mykill's previous band, Astaroth.  Singer Larry Sapp (also a member of national recording artist Brutality) performed vocals, and Tony Laureano (also a member of Malevolent Creation, Dimmu Borgir, and Angelcorpse, and several other national recording artists in the death metal genre) lent his talents in recording the drums for the CD.  Another death metal album was written, but technical difficulties and Laureano's touring schedule with Nile prevented this album from being released.

Halfway to Gone: Halfway to Gone is an American heavy metal band from New Jersey.  The band formed in 1999 when bassist and founding member of Solarized, Lou Gorra got together with Lee Stuart (Solarized's touring guitarist), and drummer Danny Gollin.  Chuck Dukehart from Sixty Watt Shaman played drums in the band for a year before being replaced by Kenny Wagner, also of Sixty Watt Shaman & Honky, who toured with them and played on "Second Season".  The band did U.S. tours & played shows with Clutch, Nashville Pussy, Nebula, CKY, Suplecs, and many others.  The band's style has been described as a mixture of Stoner rock, Southern rock and Heavy metal, inspired by Lynyrd Skynyrd and Black Sabbath, among others.  They released an album with Alabama Thunderpussy in 2000 and their own debut early the next year.  They have released two more albums since.  They went on extended hiatus in 2004 but are rumored to be doing another album in 2012 with original line up of Stu, Danny, & Lou on Smallstone Records.

Supporting paragraphs: Shaman (band) Angra (band)
Answer: Angra