Simple, just write you favourite band for each letter of the alphabet. If the bands name starts with The or A then just use the second word of their name..
Mine..
Alexisonfire
Bring Me The Horizon
Children Of Bodom
The Devil Wears Prada
Escape The Fate
From Autumn To Ashes
Green Day (just because of their older stuff)
Hopes Die Last
Iron Maiden
Job For A Cowboy (Only band on my Ipod that starts with J, I don't really like them though..)
Korn
Lamb Of God
Metallica
Norma Jean
The Offspring
Parkway Drive
Queen (Only Q band I can think of, I don't like them though..)
The Red Shore (or Rage Against the machine, Can't decide)
System Of A Down
Trivium
Underoath
V
White Stripes
X
Y
Z