what kinds of songs are these?

My Những người bạn say that these are depressing songs, I disagree I think thay are wonderful songs.

Here are the songs:
Words & a Piece of Paper bởi Hanne Hukkelberg
Eyes On ngọn lửa, chữa cháy bởi Blue Foundation
The Moment I đã đưa ý kiến It bởi Imogen Heap