Well, here's a couple of contestants at least, picked partly because they all have videos easily available.
Sielun Veljet - Ikävä
http://www.youtube.com/watch?v=GKQJ2uYPIh0
A really simple song from one of the greatest bands ever IMVHO. The lyrics wouldn't make much sense translated, but basicly the idea of the chorus is "I miss you so much I can't even sleep I miss you so much I can't even sit". I wouldn't actually put this even in the top 5 for the band, but it's still a really good song and one of the few that can be found on YouTube. (They also performed in English under the name of L'Amourder, and there's at least
http://www.youtube.com/watch?v=ayUfdcishx8 this song available, from the same year.)
CMX - Minne paha haudattiin (Where they buried evil)
http://www.youtube.com/watch?v=7zXGDIFKmdQ
"...Did I love right, or like they do in songs, replacing sensitivity with strength and will. I thought silence was a language, I thought I heard everything that wasn't said... Where they buried evil, bury me there."
I have to name this as one of my favourites, as listening to those lyrics really made some things click in my head. Also, such a marvelous band.
Kingston Wall - Two of A Kind
http://youtube.com/watch?v=UFBBQfgJ3_g
Impossible to pick a favourite song from this band, but this is good one. Unfortunately the singer/guitarist/songwriter jumped off a church couple of years later and died.
Other favourites could be something from Pink Floyd's Wish You Were Here - album, anything from Kauko Röyhkä (this is a good one for example:
http://youtube.com/watch?v=talQrtkDtvA), California Mudslide by Lightnin' Hopkins, Good Morning Heartache by Billie Holliday and and and....
Hell, I'll just put in advert for a friend here:
http://www.myspace.com/oathofessenes and
http://www.myspace.com/cantatasangui
She's the singer in both bands and the songwriter in the first one (which is according to her "the project" while Cantata is "the band". Artists

). It's just nice to know people who can make music.