I'd be very interested in hearing his explanation (or your summary thereof) if you would be so kind.
My summary would go something like this (and I welcome Steven's additions and corrections after he listens to his recording, since I didn't take notes):
1) Mr. Bychkov first conducted the Mahler Sixth about 30 years ago and has been interested in the work ever since.
2) When he first performed the work, he used the
Scherzo–Andante movement order, which was the "official" one at the time. He said he liked that order because it placed the tranquility and peace of the
Andante as an emotional "oasis" just before the tumult and upheaval of the
Finale. On the other hand, he said he was troubled by the sameness of the end of the first movement and the beginning of the
Scherzo, making it seem like he was conducting one gigantic opening movement.
3) When he was engaged to conduct the present series of concerts in St. Louis—in view of the new Critical Edition of the Sixth (Kubik, 2010)—he anticipated using the now-official
Andante–Scherzo order, and had the orchestra print programs which reflected that choice, although he confessed during this interview that he hadn't entirely made up his mind.
4) As he began to rehearse the work and experiment with options, he decided that the new order didn't work as well as the old one, so he reverted to the
Scherzo–Andante order at the eleventh hour. I believe he also said (and perhaps Steven can clarify this) that he considered doing
Scherzo–Andante on the February 4 concert and
Andante–Scherzo on February 5. He obviously didn't do that;
Scherzo–Andante was done at both concerts.
James