Your list rocks
Dresden Dolls!! I don't know a lot of their songs, but 'Coin-Operated Boy' makes me giddy every time I hear it

Panic! At the Disco--
Fallout Boy
I'm not much for MSI, but my brother adores them and an acquaintance of mine knows somebody in the band [his name escapes me at the moment...]-- I did like a couple of their songs, though- just don't know what they're called
I like so much music that my tastes are akin to someone picking out their clothes blind-folded... But I'll give it a shot
- Tori Amos
- Enya
- Sarah McLachlan
- Aerosmith
- Queen
- RENT
- Wicked [soundtrack]
- The Beatles
- The Monkees
- The Who
- L'Arc~en~Ciel
- Gackt
- Five for Fighting
- John Mayer
- The Killers
- Good Charlotte
- 3 Doors Down
- Puddle of Mudd
- Toby Keith
- Trace Adkins
- The Goo Goo Dolls
- Tchaikovsky/Beethoven/Mozart/Debussy [pick one..
]
- Yoko Kanno
- The Pillows
- The Seatbelts
..and so many more that I can't even begin to list or i'll be here all night...