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> If I hear the same song played in C, and then in Db, the two of them will hit me emotionally the same.

Do you mean you can’t tell the difference between the two? My first thought is that the difference would be obvious, but I could be wrong. Is there a pair of recordings like this anywhere, so I can try it out?

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I could tell the difference between them if you play them back to back. But if I woke up in the morning and listened to one of them, I wouldn't be able to tell you whether it was the one in C or the one in Db.

Not sure if there are recordings like this, but you could use GarageBand, Audacity, or the like to pitch-shift a recording without changing the tempo.

This would be interesting test, playing Happy Birthday in a different key.

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