Wow! - I'm getting this. I just listened to all 14 excerpts, and they all sound great. Michael Volle is terrific! Like Bernstein, the songs that have dialog or exchanges between a male and a female, use both singers (Szell too? - can't remember). I think "DKW" is hugely underestimated, and should be a prerequisite - at gunpoint, if necessary - for ANY conductor who's going to embark on a complete Mahler cycle.
I would urge everybody here to listen through these excerpts. I can't wait to hear the rest of "Revelge" (track 12).