Pop.
fantasy
Mean girls is classified by the MPAA as a comedy. While it is funny it could also be seen as a teen drama since it deals with issues common with high schoolers as well.
Pop.
realistic fiction
book
It's Pop music.
If you mean the American band Halestorm, their genre is Hard Rock.
Realistic fiction
The genre history is typically a book/movie set in the past.
A dramatic genre.
The band, Boys Like Girls, fall under the pop punk, alternative rock, and the power pop music genres. They, despite popular belief, are not a part of the emo genre.