Why does a piano go out of tune? Hoekom gaan ‘n klavier uit stemming uit?

There are a few factors, e.g. temperature, humidity, age, how hard the instrument is played and how steady the pins are in the pinblock.

Daar is verskeie faktore, bv. humiditeit, temperatuur, ouderdom, hoe hard die instrument bespeel word en hoe stewig die penne in die penblok is.