I felt the same way about M and D. Modest Mouse, mclusky, DFA 1979, and Defiance, Ohio.

And poor R... Rage Against the Machine never had a chance... :(

A - Angels of Light
B - Big Black
C - Crippled Black Phoenix
D - Darkspace
E - Envy
F - Flood
G - Godflesh
H - Heaven In Her Arms
I - Indian Summer
J - Jesu
K - Kayo Dot
L - Les Discrets
M - Mono
N - Nihiling
O - Oomph!
P - Pertegò
Q - Quadro Nuevo
R - Red Paper Dragon
S - Swans
T - Thursday
U - Up-C Down-C Left-C Right-C ABC + Start
V - Venetian Snares
W - Whitehouse
X - Χειμερινοί Κολυμβητές
Y - Yaphet Kotto

So much good on S. Nothing on Z, I'm afraid.

Based on your taste, it's possible you might like the Italian band Zu.

I checked out Zu - The Way of the Animal Powers. I found parts of it to be amazing and other parts just horrible. Thanks for the tip.

Haven't heard that one myself, only the most recent one Carboniferous.

At The Drive In
Beatles
Clash
David Bowie
Eric Clapton
Flaming Lips
Gary Numan
Hoosier Hot Shots
Ian Dury
John Lennon
King Crimson
Linoleum
Mars Volta
Nine Inch Nails
Omar Rodriguez-Lopez
Pink Floyd
Queen
Radiohead
Sigur Ros
Tori Amos
Urge Overkill
Velvet Underground
Ween
X -------
You Am I
Zappa

^Solid list. I like you.

Anthrax
The Black Crowes
Charlie Parker
Deep Purple
Eels
Faith No More
Guns N' Roses
Hellbillies
Interpol
Jimi Hendrix
Kiss
Lenny Kravitz
Madrugada
Nina Simone
Ozzy Osbourne
Pearl Jam
Queen
Rush
Steve Miller Band
Testament
U2
Van Halen
Whitesnake
xXxXxXxXxXxXx
The Yardbirds
Zeppelin

ooh it's so hard to narrow down

A - Anthony Green
B - Brand New
C - Circa Survive
D - Days Away
E - Eye Alaska
F - Faster Pussycat
G - Good Old War
H - The Honorary Title
I - Isles & Glaciers
J - Jonny Craig
K - KILIMANJARO
L - Ludo
M - Me VS Myself
N - November Blessing
O - One Over Chaplin
P - Placebo
Q - Quietdrive
R - Rob Thomas
S - The Sound of Animals Fighting
T - This Providence
U - The Used
V - Veruca Salt
W - William Control
X - ?
Y - Yukon Blonde
Z - Zolof the Rock and Roll Destroyer

Update:
A - Animal Collective
B - Bear In Heaven
C - Cream
D - The Doors
E - Eels
F - Fiona Apple
G - Glint
H -
I - Imogen Heap
J - Jeff Buckley
K - King Crimson
L - Led Zeppelin
M - Muse/My Morning Jacket
N - Nick Drake
O - Of Montreal
P - Pink Floyd
Q - Queens of the Stone Age
R - Radiohead
S - Second Person
T - Talking Heads
U - The Unicorns
V - The Vines
W - Wolfmother
X - The xx
Y - Yeah Yeah Yeahs
Z - ZZ Top