True, I don't appreciate cut & paste techniques in music or in studio arts, really. I agree it can, perhaps, add some ironic humor and the technique may be clever. But ripping the material from someone else seems like a cop-out: you couldn't figure out how to make your point on your own, so you rely on someone else to do it.
I don't mind so much "found" items being used, though, like machine sounRAB. I mostly just get irked by songs that use clips of other people speaking.
Also, sometimes when I hear songs with clips in them, I don't know where the original stuff and the regurgitated stuff begin and end. It feels as if they are trying to pass someone else's work off as their own. I assume professional musicians give credit where due, but most non-professional nu-break type songs I've heard just steal stuff from here and there and plunk them in the song.
When you start a paper with a quote, you provide the source of the quote in the paper, so that is not plagiarizing.
When you lift some part of some random TV show and smack it down in a song to make a point, a listener may not know the source, since it isn't stated within the song. So, that is like plagiarizing.
I prefer songs to be direct. If the musician has something to say, just say it; don't rely on someone else to say it for you. Plus, most of the clips I've heard used seem to be from crappy movies anyway, so I don't see the value in using the clips in the first place.
And usually the songs work just as well without the clips: the clips are not necessary. And if they *are* necessary for the song to make sense...if the whole song is some random instrumental piece that is meaningless without that clip...then I just think the song isn't very good.
Take that "Handbuilt by Perverts" song Jackhammer posted. It goes on about human remains a bit in a clip and then some other random stuff, has a bunch of drumming and repetitive guitar chorRAB thrown in, and the sound of an engine dying at the end. The point? I feel the song would be just as good, or bad, given the unintelligible murabling and screams, without the human remains clip.