There are video interviews with 26 conductors of Mahler available at
http://mahler.universaledition.com/, including the texts. Included are Blomstedt, Boulez, Chailly, Eschenbach, Gergeiv, Jansons, Mehta, Nagano, Nott, Rattle, Salonen, Tilson-Thomas, Welser-Moest, Zinman, and others. I believe all are asked the same questions. An interesting archive.
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