"badly dubbed, appallingly executed"

Is this not the problem rather than the concept of building tracks around sampled recordings?

The only way to avoid sampling in an era where sampling has become a completely normal part of music making is to keep the recordings under lock and key or for the copyright holders to get litigious. As Matt says, the recordings aren't the singers' actual performances, they are simply a recorded copy of the performances.

The genie is out of the bottle. And I suspect we are dealing with the problems of cultural and generational shifts in perspective.

Meanwhile, I don't understand how anyone can think disrespect for either the songs, the singers or the collectors is on anyone's mind when embarking in a project like this. It's not a comedy album, you know.