Hmmmm, my favorite band would have to be Evanescence. There is just something about that band that really hits me. I'm currently really addicted to...
YouTube - Evanescence-Imaginary (with lyrics)
But my all time favorite Evanescence song is...
YouTube - Evanescence - Bring Me To Life

HIM (His Infernal Majesty) would be my second favorite band. Their best songs (in my opinion) are:

• Heartkiller
• Like St Valentine
• Killing Loneliness
• Rip Out the Wings of a Butterfly

Like St Valentine:
YouTube - HIM - Like St. Valentine (Official Video - 2010)