Name that Song!

[SeaCrest]

You must post...
The theme of the song
The author (singer) of the song
A line (1) of the song
The genre of the song

The person to get the name and author of the song gets to go next.

"And her snotty little family all dressed in pastel."

[PonyGirlz]

Theme: A man is marrying "the wrong girl" (not the singer), the singer is in love with the man, and in the end he doesn't get married and runs away with the singer.
Singer: Taylor Swift
A Line: "I'm not the kind of girl who should be rudely barging in on a white veil occasion"
Genre: Country

My turn!

"It's my life, and it's now or never, I ain't gonna live forever!"