Spectrogram illustrating combination of harmonics in trumpet tone for single note.
Variations in brightness in these harmonic bands correspond to variations in loudness of sound from the harmonics: brighter parts of bands corresponding to louder parts of sound from the harmonics. The ascending series of pure tone harmonics have frequencies, and pitches, as shown at the top of the figure below. From12.0 seconds onward, these 8 harmonics combine to create one tone, the tone of a trumpet. At the bottom of the figure below, we have the notes on a treble staff for the first six harmonics, which is part of the harmonic series for the note C4.
First six notes in the harmonic series for C4.