Bands You're A Completist About

The Mountain Goats
Alkaline Trio
Ran Adams
Social Distortion

Pavement
Neko Case+The New Pornographers/A.C. Newman/Dan Bejar
Dillinger Four
The Minus 5
The Hold Steady
The National
The Vindictives
Traitors

Tool
Puscifer
A Perfect Circle
Kottonmouth Kings
Live
Eminem

New Order
Daft Punk
The Arcade Fire
Joanna Newsom

Opeth
Mudvayne
Mike Patton (hasn't been an easy task)
Marilyn Manson
Massive Attack

Avenged Sevenfold
Motley Crue
Rob Zombie
Aiden
so much 80's music I love and wil always love

Opeth!!!

Deftones
Muse

blank dogs

i can't even fully explain my devotion, but i need physical copies of everything the dudes' ever made

Tom Waits (I even have crappy soundtracks like 'One From The Heart' and 'Paradise Alley' because they feature Waits songs)

New Order
Joy Division
Peter Gabriel
U2
Radiohead

Death Cab For Cutie & Damien Rice.

The Birthday Massacre (I seriously have everything they have ever released, and if you've seen my posts in here, you'll notice that I'm completely obsessed with them >.>) I've seen them live three times and I will see them live as many times as I possibly can hahahaha

Kill Hannah (I have most things, a lot of thanks goes to my friend Chrissy for that)

I used to be like that with Marilyn Manson too, but since his latest release, I just got kinda over it. That was more in my supah goth days. (13-16) Not saying I don't fully enjoy his older releases, but the new stuff just isn't my thang.

The Smiths-(Morrissey)
Clutch
Neko Case
The Chameleons

tom waits
the beatles
alice in chains
the cure

i'm kind of a completist all around, but the ones that i'm first in line to pay for instead of acquiring through other means:

Ween
Tom Waits
anything Nils Frykdahl touches (Sleepytime, Faun Fables, Idiot Flesh, Charming Hostess....)
anything Mike Dillon touches (Billygoat, HairyApes BMX, Garage a Trois, Critters Buggin'......)
Mr. Bungle
Secret Chiefs 3
Jane's Addiction

haha i have 'one from the heart' on vinyl for the same reason

I third this.

Also, The Clash and anything Jack White (solo, The White Stripes, Dead Weather, The Raconteurs, etc)

I have quite a few because I get obsessed hella easy with bands.

Jenny Lewis. Anything she's in/done. Rilo Kiley. Solo stuff. Random songs from other bands that happen to have her vocals in.

Christina Aguilera because 8th grade me will always be present in my music taste.

Good Charlotte, see above for the reason.

The Beatles.

Also, I'll add the Felice Brothers. They're a newer obsession of mine, but an obsession, none the less.

Coalesce.

..

Pixies, Prince, and (I hate to admit) Showoff.