Eli5: Why can different singers sing the same song with the same notes but still sounds different?

Question

I understand notes as the wavelength one tone hits. Then if very skilled singers would sing the same song and hit every note right. Why does it still sounds like different people? Our ears just hear the soundwaves right?

In: 1

Answer 1

Same reason a guitar and a banjo sound different – the space in which the sound is developed is different and the hole it comes out of is different. Plus, singers also change the shape of their instrument and their hole as they sing.