Nightwish
Genre: Melodic Heavy Metal
Sonata Arctica
Genre: Power Metal
Sentenced The site contains five full songs as well
Genre: Power Metal/Hard Rock/Death Metal (depending on when the album was released...)
The Berzerker
Genre: Aggressive Industrial Death Metal
(NOTE! The tracks "Reality" and "Rare Reality Demo" aren't worth of listening, the reason described on the link under the "Rare Reality Demo")
Tarot
Genre: Heavy Metal
Stratovarius
Genre: Power Metal
All of the links are to each band's official site!
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"As we all know, holy men has born during Christmas...
Like mr. Holopainen over there!"
- Marco Hietala, the bass player of Nightwish