Change in Timbre With Transposition

High and low tones from the same instrument do not have the same relative spectrum; for instance, a piano’s high and low notes have very different timbre qualities.

Following is a bassoon playing 3 octives. After that are simple transpositions of the bassoon’s highest pitch tone. How different do they sound?

High and low tones from the same instrument do not have the same relative spectrum; for instance, a piano’s high and low notes have very different timbre qualities.