I've been practising Mahler's 5th Symphony for quite a while now on the piano (the transcription/arrangement by Otto Singer II) and I recently realized that I was playing a D instead of a D-flat, which is what the notes actually suggest:
This is a passage from the third movement (the Scherzo). When playing it again with a D-flat it sounded so off compared to what I had heard countless times listening to this recording that I had to go back and check:
No matter how many times I replay that part I keep hearing a regular D. The same goes for this one conducted by Barenboim. I did read this question about why some recordings seem to be in a different key, but that is not the case with this question. It's literally just this one note during this passage.
Am I hearing this correctly? - I don't have perfect pitch but this seems pretty clear to me - Am I wrong? Are both my ears and my piano so far out of tune? I have a strong feeling that I'm missing something pretty simple here, but what?
I also thought that it might just be a transcription error so I looked into the orchestra score but that one also says D-flat: