Charlie
Charlie likes alternative and rock music, some pop but mostly rock.. some of these (eg. Eminem, Jamie Cullum) may be more respect than liking the music though.

Aerogramme
Avril Lavigne (ish)
Biffy Clyro
Blink 182
Brigade (his brother Will's band - click for more info!)
Britney Spears (although looks more than music heh)
Dead Kennedy's
Deftones
Eminem
Fall Out Boy
Funeral For A Friend
Good Charlotte
Guns'n'Roses
Guided By Voices
Hundred Reasons
Jamie Cullum
Jimmy Eat World
Kelly Osbourne
Last Days Of April
Lost Prophets
Metallica
Michelle Branch
Muse
My Chemical Romance
My Morning Jacket
Nada Surf
Nickelback
Nirvana
Notwist
Pantera (older stuff)
Psyked Up Janis (thanks Simone)
Queen
Radiohead
Raveonettes (thanks Simone)
Red Hot Chili Peppers
Silverchair
Sonic Youth Movie Strategies
Sparklehorse
Taking Back Sunday
The Darkness
The Flaming Lips
The Killers
The Starting Line
Thursday
Undesided (thanks Catherine!)
Zwan