A- Z, Best music group/act/artist

[loose passive]

In your opinion who is the best music group/act/artist for each letter.

Example:
A- Air
B- Beatles
C- Coltrane
D- Doors
E- Eminem
F- Foo Fighters
G- Gorillaz
H- Hendrix
I- Ice Cube
J- Jay-Z
K- Kraftwerk
L- Led Zeppelin
M- Bob Marley
N- Nirvana
O- Outkast
P- Pink Floyd
Q- Queen
R- Rolling Stones / Radiohead
S- Snoop
T- Tool
U- UNKLE
V- Violent Femmes
W- White Stripes
X- ?
Y- ?
Z- ?
(list not final)


What is your list? Any X,Y, or Z nominees?