Ok, I'll start with what I've been into most recently.

Dr. Dog

http://www.youtube.com/watch?v=hOB4xREUk_8

http://www.youtube.com/watch?v=9_4_By9NJOc

The Strokes

http://www.youtube.com/watch?v=_l09H-3zzgA

http://www.youtube.com/watch?v=6ux2GZ1OF3w

And now, two of my favorites.

Band of Horses

http://www.youtube.com/watch?v=zEGGCKF5OTA

http://www.youtube.com/watch?v=jPHXj_FbqgA

Brand New

http://www.youtube.com/watch?v=1ZQTwkcX4Ik

http://www.youtube.com/watch?v=LGKsnNaSPm0

I know it's a lot, sorry, but I will leave you with my ring tone.

Yasunori Mitsuda  (Frog's Theme)

http://www.youtube.com/watch?v=fMzkUriqXvs

Between the buried and me:

Ants of the sky
http://www.youtube.com/watch?v=oipeeZs65EI

Selkies- the endless obsession
http://www.youtube.com/watch?v=19UZd_DKs2Q

Obfuscation
http://www.youtube.com/watch?v=Ovq8QlYE_q4


Beneath the Sky

Belle of the Ball
http://www.youtube.com/watch?v=_GfUQz6COjo
(becomes a much different song halfway through)

AFI

Total Immortal
http://www.youtube.com/watch?v=v6FFfoIdikk

A good starting point, Ill post more later

BTW if you like metal you have to listen to Between the Buried and me- they are far and away the best metal band of all time

The best dubstep around

http://www.youtube.com/watch?v=VEmM6vVFrao

http://www.youtube.com/watch?v=FsNYcEsGpGo

http://www.youtube.com/watch?v=wWC_WZ7gd6g

http://www.youtube.com/watch?v=3Q9rewnLFYw

If you have absolute shit speakers and no subwoofer don't even listen to this music. It's just not worth it.

Many bands say otherwise, I'll start with Black Sabbath.

A safe bet, since as an originator of the genre they automatically get bonus points when ranking. However BTB is still better overall.

They have some pretty epic musics, and they have been around for a while (since 2002, when Mark Jansen left After Forever). They carry on with the After Forever legacy of mixing Symphonic metal with epic chords and powerful female voices (Simone Simmons is a goddess, both in voice and features ).

I can point you towards a few personal favourites of mine from Epica, such as Burn to a Cinder, Blank Infinity, Cry for the Moon, Unleashed, Semblance of Liberty, Consign to Oblivion, Quietus, Feint, Chasing the Dragon, Never Enough, Martyr of the Free Word, Sancta Terra, Mother of Light and Illusive Consensus. 

Their best albuns, so far, have been The Phantom Agony and Consign to Oblivion, though their latest one, Design your Universe is pretty epic as well. I also recommend you (if you enjoyed the original versions) to listen to their rendition of the Imperial March and POTC themes. 

Kinda of a tall accomplishment to be called the best metal band of all time, especially when they're hardly known outside the US. They still have a lot of ground to cover if they want to be called that. Heck, I think that Epica, Nightwish, Cradle of Filth, Moonspell and After Forever are some of the best bands of metal ever, but they're nothing compared to some of the true best of all time like Metallica, Motorhead, Iron Maiden, Black Sabbath, Anthrax, Sepultura, Slayer, Megadeath and AC/DC.

um, it is pretty much a tie for all three top songs for me.

Call Me-Shinedown

45-Shinedown

I Dare You-Shinedown

Each one of these is a final song on one of their 3 total albums they have released. The singing is absolutely and totally mind boggling, not to mention the lyrics are phenomenal.

I can definitely say that i have no favorite music, though it always follows a similair soundpattern.
But those are pretty much my most heard ones.

Some of the finest liquid dnb. So simple yet so pleasing:
http://www.youtube.com/watch?v=6GTEaFT-0wQ&feature=channel_video_title
Definitely one of my most heard songs of all time:
http://www.youtube.com/watch?v=OjQqYFNK50M
An inner love conntects me with this song:
http://www.youtube.com/watch?v=enNE2oSTCKs
best techno song of all time:
http://www.youtube.com/watch?v=XmzP-DVy-0w