Real pianos are unique instruments that have an interesting set of tuning problems that most players aren't aware of.
Here's a great video that explains why perfect tuning of a piano is impossible, Kahn Academy-style.
Beware - there's some physics involved here but it's laid out enjoyably well.
2 comments:
Good video, but a guitar is also not perfectly in tune because it has frets, i.e. it uses tempered tuning. You can "sweeten" the tuning so it sounds better in certain keys, but then other keys will be out of tune.
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