1.
Presidents Of The USA - Self titled
I was a late starter. I never really enjoyed any music (other than the Ninja Turtles theme) until I heard the singles from this.
2.
Metallica - Load
Again, late starter. Most of the tracks that initially got me into Metallica were off their self titled album but "Load" was the first CD I actually purchased... by them or by anyone. Once exposed to metal I was hooked and have never looked back.
3.
Iron Maiden - Ed Hunter
The first CD I bought when I decided to try expanding my scope beyond 24/7 Metallica. While the mate who introduced me into Metallica was branching down more of a thrash and death direction, Iron Maiden made me more aware of melody, as well as the fact that you can be in a metal band AND actually sing at the same time.
4.
Cradle Of Filth - Midian
I was seeing a goth chick at the time and she was into what at the time seemed like a lot of crazy shit. Most of it I still think is crazy shit but something about "Chthulu Dawn" grabbed me and I decided to get the whole CD. It was the first album I owned in the black/death direction and still one of my favourite black metal albums (and bands) to date.
5.
MP3.com and Napster
Not albums as such but they expanded my musical horizons more than anything else (except IRC which came later). It was through MP3.com that I got onto everything from Blind Guardian, Vanden Plas and Angra to Flatstick and Lemur Voice. Although the local retail front has admittedly gotten a lot better with the likes of Utopia, Post Mortem Records and JB Hifi, I highly doubt I'd have escaped the mainstream metal box without the freedom offered by MP3.com and Napster.
6.
Helloween - The Dark Ride
By far the most emotional and haunting thing I'd heard at the time while still having an awesome heaviness about it and somehow still managing to maintain a sense of humour on top of all that. "Sun Is Going Down" still sends shivers down my spine.
7.
Dream Theater - Images And Words
I stumbled upon "Under A Glass Moon" through Napster... and time stood still
. Although it's far from my favourite Dream Theater album now, listening to songs like "Pull Me Under" and "Learning To Live" for the first time was more of a pivotal influence on me as a musician than anything else (until Tommy came along).
8.
Lemur Voice - Divided
Ice Age - The Great Divide
Dali's Dilemma - Manifesto For Futurism
Mullmulzzler - Mullmuzzler
ARK - Burn The Sun
No single album stands out in particular above the others as they all form what I believe to be the "Golden Age of Prog Metal". Each took what I loved about Dream Theater and added their own twists in a way which created this fascinating and broad palette of sounds and textures while still offering a comfortable familiarity between them.
9.
Tommy Emmanuel - Only
When I heard (and saw) Tommy Emmanuel on This Is Your Life a few years ago my jaw hit the floor. I rushed out and bought "Only" the next day... well, ordered it in, as I couldn't find anywhere that stocked it... but once I finally did get my hands on it I was hypnotised. This is the album that made me put electric guitar to the side and focus on my acoustic guitar technique and song writing.
Those are about as accurate a set of steps as I can come up with. 10 would be stretching, though Marilyn Manson's "Mechanical Animals", Megadeth's "Youthanasia", Joe Satrian's "Strange Beautiful Music", Spazz's "Crush Kill Destroy", Queensryche's "Promised Land", Kamelot's "The Fourth Legacy" and Adagio's "Sanctus Ignis" feel like they deserve mentions in there somewhere as key albums in my musical journey.