Roots of Sonata Arctica

Delain is a Dutch symphonic metal band formed in 2002 by keyboardist Martijn Westerholt. After his departure from Within Temptation in 2001, Westerholt formed Delain the following year, intending for the band to be solely a project, but stopped after the release of one demo. In 2005, Westerholt restarted Delain alongside singer Charlotte Wessels, and released the debut studio album, Lucidity, in September 2006. The band began to perform publicly following the positive reception the album received.

Megadeth is an American heavy metal band formed in Los Angeles in 1983 by vocalist and guitarist Dave Mustaine. Known for their technically complex guitar work and musicianship, Megadeth is one of the "big four" of American thrash metal—along with Slayer, Anthrax, and Metallica—and is credited with helping to develop and popularize the genre. Their music features intricate arrangements, fast rhythm sections, dual lead guitars, and lyrical themes such as war, conflicts, politics, religion, death, and personal relationships.

Stratovarius is a Finnish power metal band formed in 1984. They have released sixteen studio albums, six DVDs, and six live albums. The band's line-up has changed many times, with no founding member left since the departure of drummer Tuomo Lassila in 1995, and no member from their early recording days left following guitarist Timo Tolkki's departure in 2008. Currently, the longest standing member is singer Timo Kotipelto, who joined in 1994.

Nightwish is a Finnish symphonic metal band from Kitee. The band was formed in 1996 by keyboardist Tuomas Holopainen, guitarist Emppu Vuorinen, and former lead vocalist Tarja Turunen. The lineup grew with drummer Jukka Nevalainen and bassist Sami Vänskä. In 2001, Vänskä was replaced by Marko Hietala, who also took over the male vocalist role previously filled by Holopainen or guest singers. Nightwish has been successful in Finland since the release of their debut album, Angels Fall First (1997), and were later recognized internationally through the release of their albums Oceanborn (1998), Wishmaster (2000) and Century Child (2002).

DragonForce are a British power metal band from London, formed in 1999. They are known for their long and fast guitar solos, fantasy-themed lyrics and retro video game-influenced sound. The band themselves refer to their music as "extreme power metal".

Tuomas Lauri Johannes Holopainen is a Finnish musician, songwriter, and record producer, best known as the primary songwriter, keyboardist, and founding member of the symphonic metal band Nightwish. He has stated that his songwriting is influenced by harmonic film music.

Spinefarm Records is an international record label. Founded in Finland in 1990, Spinefarm was acquired by Universal Music Group in 2002.