First reviews of the tenor singing both parts of Das Lied von der Erde with the Vienna Philharmonic are decidedly mixed. Gustav Mahler specified a tenor for three songs and an alto or baritone for the other three. Kaufmann decided to do the lot himself. Substitute Jonathan Nott conducted.
Kaufmann had no problem with the top notes. But, according to some reports, he transposed the closing ‘ewig, ewig’ one octave upwards.
Other questions: Could one singer capture the entire gamut of emotions? Is the dramatic intensity sustained? Why did Kaufmann decide to do it at all?