Music is my oxygen - it's the medicine I need to feel good, to be sane in an insane world. It expresses what I do not have the courage to say but need to, it alters my moods, gives me perspective. Every song my collection serves a purpose in being there. I will listen to just about anything from any genre - as long as it's good. All of my favorite artists' songs have a good beat/melody/harmony, meaningful lyrics, and the vocalist has some degree of talent. Language is not a factor.  

The Best Music Era (all genres included): 1990-2002
Seal
Whitney Houston
Brian McKnight
All-4-One
Boyz II Men
R. Kelly
2Pac
Mariah Carey (before her voice just...well, ya know)
Collin Raye
Eurthymics/Annie Lenox
Usher (in his best years)
Michelle Branch
Tracy Chapman
Toni Braxton

R&B/Hip-Hop/Rap/Reggae
Chris Brown
Mary J. Blige
Rihanna (pre-February 2009, though I love Russian Roulette)
Eminem
Ludacris
Black Eyed Peas (pre-THE E.N.D [or however it's stylized] album)
Keyshia Cole
His Majesty Baker Jr.
Lady Saw
Elephant Man
Alicia Keys
Sean Paul
Usher (pre-Here I Stand album)

Pop
Christina Aguilera
Britney Spears (the pre-Toxic era)
JoJo
*Nsync
Backstreet Boys
NLT
P!nk
 Jonas Brothers (second album ONLY)
Jesse McCartney 

Hard-Classic-Symphonic-Christian-Pop Rock
My Chemical Romance
Seether
Evanescence
Apocalyptica
Bullet for My Valentine
Panic! at the Disco
Paramore
Broken Iris
Skillet
The Fray
Nickelback
Three Doors Down
Saliva
Nightwish
Within Temptation
Avenged Sevenfold
Linkin Park
Avril Lavigne
Daughtry
Lifehouse
Aerosmith
Disturbed
the Beatles
The Goo Goo Dolls
Red
The Vincent Black Shadow
Switchfoot
Creed
The Ataris
P!nk
Thriving Ivory
Breaking Benjamin
The Script

Country
Carrie Underwood (Some Hearts is still my favorite album from her)
Rascal Flatts
Taylor Swift (she's not country, and she's gotten beyond annoying)
Shania Twain
Collin Raye

Foreign Language Artists

Alternative (in my definition, just cause I don't categorize them in any other...well...category. lol)
Gavin DeGraw
John Mayer
Natasha Bedingfield
Natalie Imbruglia
Colbie Caillat
Jason Mraz
A Fine Frenzy
Stateless
Florence and the Machine

There are more, of course, that I listen to regularly - my headphones are forever attached to my head - but I can't remember right now.

Favorite Songs of All-Time (These are the songs I wouldn't mind listening to for the rest of my life if I had pick from the 1000s of songs I have)
My Heart Will Go On - Celine Dion
Every Heart (Minna no Kimochi) - BoA
Broken - Seether feat. Amy Lee
Broken - Lifehouse
Torn - Natalie Imbruglia
Kimi Ga Oikaketa Yume/Last Song - Gackt
I Don't Wanna Be - Gavin DeGraw
My Immortal - Evanescence
Unwritten - Natasha Bedingfield
I Have Nothing/Count on Me - Whitney Houston
How Do I Live - LeAnn Rimes
How to Save a Life - The Fray
Lose Yourself/Sing for the Moment/The Way I Am - Eminem
Hand of Sorrow - Within Temptation
Breaking the Habit - Linkin Park
Afterlife/Beast and the Harlot - Avenged Sevenfold
Open Arms - Journey
Rise - Origa
I Think I - Byul
My Boo - Usher feat. Alicia Keys
Truly, Madly, Deeply/ Crash and Burn/ I Knew I Loved U - Savage Garden
Haru Haru/A Fool's Tears/Forever with You - Big Bang
Hero/Through the Rain - Mariah Carey
Sweet Dreams - Annie Lennox
Dare You to Move - Switchfoot
U Saved Me - R. Kelly
All My Life - K-Ci and JoJo
I'll Be - Edwin McCain
Back to One - Brian McKnight
Another Sad Love Song - Toni Braxton
The Hardest Thing - 98 Degrees
Nara - E.S. Posthumus
Lady Marmalade - Christina Aguilera, Pink, Mya, Lil' Kim, Missy Elliott
You Gotta Be - De'sree
Map the Soul [English Version] - Epik High
No Air - Jordin Sparks and Chris Brown
At the Beginning - Donna Lewis and Richard Marx
You Are Not Alone/Will You Be There - Michael Jackson
The Climb - Miley Cyrus
God Must Have Spent a Little More Time On You/Music of My Heart/This I Promise You - *Nysnc
Nobody Knows - Tony Rich Project
Give Me One Reason/Fast Car - Tracy Chapman
When You Believe - Whitney Houston/Mariah Carey
Cry - Mandy Moore
Breathe (2AM) - Anna Nalick
She's Gone - GDragon
Mad World - Adam Lambert
Metro - The Vincent Black Shadow
Before the Worst - The Script
Cut - Plumb
Gravity - Sara Bareilles
Bloodstream - Stateless
Only One - Alex Band
The Boys of Summer - The Ataris

Favorite Albums of All Time
Stripped - Christina Aguilera
Comatose - Skillet
Number Ones - Michael Jackson
No Strings Attached - *NSYNC
#1 - The Beatles
Curtain Call - Eminem
All the Right Reasons - Nickelback
Fallen - Evanescence
Sixth Day - Gackt
Thriving Ivory - Thriving Ivory
Direct Hits - Collin Raye
Daughtry - Daughtry
Popstars - Eden's Crush
Some Hearts - Carrie Underwood
Unearthed - E.S. Posthumus
Anastasia - Original Movie Soundtrack
Funhouse - P!nk