60's: Proably Beatles, though I listen hardly any music from that time...
70's: no favourites...
80's: Tarot - Very good metal band, I especially liked their singer's voice (Marco Hietala, who now also plays and sings in Nightwish)
90's: Nightwish - My all time favourite, the band which led me to the metal music. There is just something beutiful in their music and especially in lyrics...
@Seejai...
You know, you could have used edit button instead of posting new post only one minute from your previous... double posts aren't too liked here if hose could have been avoided...

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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