Alright...well...it's still early, and I was gonna wait til later when I have a better chance of making sense...but..meh...whatever...I'll attempt now.
First, I didn't vote correctly in the poll, because I don't think any of those describe me exactly. I wouldn't describe myself as a fanatic, but I do love music. I would describe the fanatics as those of you who have 40 posts in every one of the music threads that get posted on here. But...I also don't fit into the 'not really into it that much' or 'I'm a musician' categories.
Do I have a favorite artist? I have before, but now, not really...there are tons that I love in a wide array of genres. I've grown up listening to country, so that's definitely what I listen to the most. But...I like older rock and metal a lot, too, along with some more pop-ish/ alternative type stuff...older stuff there, too, mostly. Oh...I like a lot of much older stuff, too...songs like 'Son of a Preacher Man" and "Can't take my eyes off of you" (an all time fave).
Recently, thanks to Joe and Lilman, I've gotten into classical, too. "The Red Violin" by Joshua Bell is just about the absolute most beautiful music I've ever heard.
For the most part, when it comes to individual favorite songs, I like things I can sing to (even though I suck at singing and have an ugly voice)...because...just like you said about music changing your mood...it does that same to me, but actually singing does so even more. Not much can put me in as good of a mood as singing can. So...that being true, much of the music I have is country...and it's country from the 90's! One my repeating playlist lately, (as chat knows all too well) is...
Fishin' in the Dark -Nitty Gritty Dirt Band
To make you feel my love -Garth Brooks
My Baby Loves Me -Martina McBride (that's also my ringtone when Erik calls!

)
Meet in the Middle -Diamond Rio
Son of a Preacher Man -uh..can't remember..is that Aretha?
Can't take my eyes off of you -Frankie Vallie
She don't know she's beautiful -Sammy Kershaw
....and about 20 others.
So...I don't think I fall into any of your categories, but I think I love music.