I don't really think the Linkin Park song and GUILTY are related. A song of that type isn't really that unusual of a thing.
Also, I always figured that Pride and Crucif(y/ied?) both sampled the same piece of classical music or something. Because I remember that GEO does that kind of often in Sweetbox's music. Then again, I really don't know anything about anything.
The Hoobastank song and taskinst though... I can't say anything about that.