This is a screenshot of Overtone Analyzer with a recording of overtone singing. In the central area you see a spectrogram of a sung tone that is slightly higher than f. The overtone slider overlay shows that the emphasized overtones rise from the fourth to the twelveth harmonic and then go down again. This is repeated one more time. On the left side you see the logarithmic frequency scale, a piano keyboard and the musical staff which relates the frequencies in the spectrogram to the corresponding musical notes.