At BitPerfect, we love our Mahler, and one of the finest Mahler recordings available is – in our opinion – Ivan Fischer’s wonderful account of the 4th Symphony with the Budapest Festival Orchestra released by Channel Classics. Thanks to Linn Records, this magnificent recording is available for download in your choice of high-resolution formats, up to 24bit 192kHz.

http://www.linnrecords.com/recording-gustav-mahler-budapest-festival-orchestra.aspx

On my system, I find that this recording needs to be played with the the absolute polarity inverted. With BitPerfect, just edit the iTunes comment field for each track and insert the word ‘invertpolarity’ (no quote marks required) anywhere in the comments field, and BitPerfect will take care of this for you.