I'll start with my list; (No particular order)
Rise Against
Megadeth
Queens of the Stone Age
Blue Oyster Cult
Arctic Monkeys
We Are Scientists
Franz Ferdinand
Interpol
Alice in Chains
The Rolling Stones
I realized I like alternative a lot. Now list yours; Feel free to add reasons.
In no particular order:
Queen
Elton John
AC/DC
Me First and the Gimmie Gimmies
CCR
Regina Spektor
Kansas
Audio Adrenalene
That Handsome Devil
The Eagles
Styx
uhhhh favorite? i guess ill just list my most played
Bright Eyes
Brand New
Beulah
Tilly and the Wall
Sufjan Stevens
Neutral Milk Hotel
Cursive
Manchester Orchestra
Two Gallants
The Shins
I don't know if I have 10 I can list as top favorites.
I know Queen, The Beatles, Daft Punk, and Los Campesinos! can be, since I can never get tired of listening to them.
I'm not much of a band person, bah....
Daft Punk
Gorillaz
Linkin Park
Black Eyed Peas
Bon Jovi
Skillet
New Kids On The Block
Yeah, here's top 10 most played which pretty much equals favorites.
Los Campesinos!
of Montreal
Islands
Noah and the Whale
Modest Mouse
Tullycraft
Architecture in Helsinki
Clap Your Hands Say Yeah
Fishboy
Neutral Milk Hotel
Tool
Senses Fail
die!!die!!color!!!
Muse
The Adventures Of Duane & BrandO
The Offspring
Pendulum
Maximum the Hormone
Arctic Monkeys
All That Remains
idklol
Uh, in no particular order...
AC/DC
Optimus Rhyme/Supercommuter
Them Crooked Vultures
Rush
Trooper
The Soundtrack of our Lives
Brooks and Dunn (duo = band imo)
Daft Punk
Styx
Tiesto (when coupled with a group...?)
According to Last.fm, my most played:
Red Hot Chili Peppers
Pink Floyd
Yes
System of a Down
Soundgarden
Daft Punk
AC/DC
Saliva
Queen
Aerosmith
And it's a fairly good list, so I'll keep it.