Everyone of Katy's videos are amassing, I could watch them over and over

Britney: Gimme More (Too cheap, I hope someday the full funeral version will leak) and Break The Ice (I hate animated videos)
Madonna: Everybody (There's nothing special about it)
Christina: I Turn To You (It's not even bad, it's just my least favorite out of all of the amazing videos she has)
Demi: Get Back (Same case as Madonna's)

Gaga - The Edge of Glory

Mariah - I Want To Know What Love Is

Ashley Tisdale - Suddenly

Sparks Fly And well fanboy pointed out all the reasons

Amassing?

Hmm I'm not sure. I suppose Shampain or Obsessions? Not counting Seventeen, of course.

Probably All American Girl..

Eh Eh or The Edge of Glory