Californication, The Red Hot Chili Peppers: At first it seemed pretty superficial ,but in the end it's message really got to me.

Tommy, The Who: Hooked me on Rock Opera's.

Can't Buy A Thrill: Got me hooked on Jazz fusion, leading to Jimi Hendrix.

Dark Side of the Moon: Got me hooked on Prog.

In the Aeroplane Over the Sea, Neutral Milk Hotel: It just makes me feel happy...

Fresh Fruit for Rotting Vegetables
Daydream Nation
Loveless
Tago Mago
Trout Mask Replica

5 that changed my life... in order of which i listened to them.

The Cooper Temple Clause - See This Through and Leave
Tool - Lateralus
Isis - Oceanic
Khanate - Things Viral
Animal Collective - Feels

1. The Fall Of Troy - s/t
2. Django Reinhardt - Djangology
3. Cirlce Takes The Square - As The Roots Undo
4. Madvillain - Madvillainy
5. Elmore James - The Sky Is Crying

I'll try and get this in the right order.

The Human League - Hysteria
The first album I ever got on tape and the first album I ever actually asked for. I think I got it when I was about 6. The Human League were the first band I realised that I loved.

Spice Girls - Spice
I'd never really been obsessive about a group until The Spice Girls arrived.

Aphex Twin - Richard D. James Album
Up until this point I was only really listening to electronic-based music that made it into the charts. This album encouraged me to explore a bit more.

Deftones - White Pony
I was a teenager when this was released and the sound summed up my life so perfectly. I think this was the album that made me want to find something heavier after a while and eventually I got into metal.

Boards Of Canada - Geogaddi
This was a bit like the Aphex Twin revelation but it had a lot to do with the feelings the music created rather than just the music itself.

Thrice- Illusion of Safety
Got me into "hardcore" and was the first "alternative" album I ever loved, I used to listen to that album, whole, each day, at least once.

U2- Joshua Tree
I'm sure I'll get grief for this, but they were the first non Dave Matthews Band, band that I got into.

Dave Matthews Band- Before These Crowded Streets
I still love this album, I realize that DMB is nothing like what they once were, but this album was so great, Halloween, The Stone and Crush are still amazing tracks.

The Cure- The Cure
Obviously not their best album ever, but I remember seeing the album cover in a Target and thought it was brilliant, they basically got me into Indie rock.

Bright Eyes- Lifted, Or The Story Is In The Soil Keep Your Ear To The Ground
Got me into folk, and Bright Eyes in general, which led to me listening to Elliott Smith and then it went from there. I don't like this album as a whole like I used to, but I still love Bowl of Oranges, Waste of Paint, and Method Acting.

It's really difficult to narrow it down to ONLY five albums.. let's see..

KISS -Alive II - this one probably started everything for me- I was at that perfect age when I put down my comics and saw KISS on tv and said "real-life superheroes!!!" When Ace had sparks flying out of his guitar- that pretty much did it for me- I was toying around with my dad's guitar before this- but never really got serious until KISS was the catalyst.

Jeff Beck- Blow by Blow: This album showed me what COULD be done with a guitar and just opened my mind to new concepts of leads, arrangements, rock, jazz, funk, fusion.

Steve Vai- Passion and Warfare: For the same reasons as Jeff Beck- only taking it 10,000 steps further!

Miles Davis: Kind of Blue- because this album blows your senses AND grounds you all at the same time. For me, listening to this album puts me in touch with something deeper- and it made me try to play these lines on guitar- thus opening my mind to a whole new level of thinking in terms of guitar playing.

the fifth is difficult to narrow down to only one.. but I'm torn between Yngwie Malmsteen's Rising Force (1st album) or Iron Maiden's Powerslave

1. Third Eye Blind - self titled

2. U2 - Joshua Tree

3. Enigma - The Cross of changes

4. Eiffel 65 - Blue

5. Static X - Wisconsin Death Trip

(never thought you'd see Static X next to Eiffel 65, did you?)

i'd say these 5 groups in general made a major impression on me as a person and as a musician.

The Cure - Greatest Hits really changed my musical perspective.
Some others are:
Nirvana - Nevermind
Metallica - Metallica
Tool - Aenima

The Who - Who's Next: This album made me appreciate how great rock music truly sounded.

Slint - Spiderland: I was quickly turning against alternative music, all the college rock bands were signing to major labels & the 80's left me with a bad taste. But this album was totally different from what I was watching on MTV, reading in Spin & listening to.

Sebadoh - III: Made me swear my allegiance to indie rock.

Lucinda Williams - Car Wheels On a Gravel Road: Filled in an era where I grew disillusioned to indie rock (just as I did with alternative) & didn't want 'image' but honest good music.

Radiohead - Kid A: Rock isn't dead, it's just growing up.

These are just from memory, their probably were albums that meant more to me at the time, but this is all I can remember for now.