my all time favorite band is
Queen 
some other bands that I like are (not in any particular order)
Wednesday 13 / Frankenstein Drag Queens From Planet 13 / Murderdolls
Rammstein
the gazette
MUCC (#2)
an cafe
our lady peace
nobuo uematsu
the pillows
utada hikaru
gackt
miyavi
mc chris
mindless self indulgence
maximum the hormone
heartsdales (super star only)
dope
disgaea osts
deathstars
bloodhound gang
aya hirano
great big sea
journey
key sounds label
linkin park
l'arc~en~ciel
LM.C
sum 41
slipknot (iowa and s/t)
turisas
vamps
wakeshima kanon
there are many more bands that I like but I can't think of anymore off the top of my head