Beethoven's "Fidelio" with the Wiener Philharmoniker conducted by Wilhelm Furtwängler.
It is -- so far as we know -- the only CD ever released with two mono tracks, one in the left channel and one in the right, so as to get 02:24:24 on one CD.
Recorded 1953, released 1987 at the start of the CD era... back when people still thought maybe the CD standards could be played with a little bit.
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