So, I see all these usernames, but know nothing about you people, or what you are interested in. So, what's everyone's favorite music? Feel free to post a link to like a youtube video or something...

I'll start off:
I'm a dedicated fan of Electronic music (trance and techno in particular) and will listen to most of it (except maybe speedcore and some of the sillier subgenres). As an introduction to Electronic music, I really suggest this video:

"A Quick Guide To The Sub-Genres Of Electronic Dance Music"
http://www.youtube.com/watch?v=Ebv_DPEB_WE

Description:
Confused about what is what in EDM (aka Electronica)? I can help! This video has samples for most of the major Subgenres of Electronic Music (focusing heavily on the varieties of Trance):

Acid Trance
Ambient Breaks
Ambient (Chillout)
Anthem Breaks
Breakbeat (Breaks)
Classic Trance
Downbeat (Downtempo)
Dream Trance
Drum N Bass (DnB)
Dutch Trance
Electro (Electropop)
Eurodance
Euro-Trance (Pop Trance, Epic Trance)
Freestyle (Dance)
German Trance
Goa Trance
Happy Hardcore
Hard House
Hard Techno
Hard Trance (Hard Dance)
Hardcore
Hardstyle
House
Ibiza Trance
Jumpstyle
Jungle
Minimal Techno
Neo-Trance
Progressive Trance
Psytrance (Psychedelic Trance)
Tech Trance (Techno-Trance)
Techno
Trance
Trancecore
Tribal
Uplifting Trance (Euphoric Trance, Anthem Trance)