| Overtones, etc. | Theory Things William Wieland |
| Ask me about my beads. | |
| Search for Alphorn. | |
| Overtone Series | |
| The most mind-blowing concept in music (Harmonic Series) | |
| Harmonic series (music) (Wikipedia article) | |
| polyphonic overtone singing - Anna-Maria Hefele | |
| How Old Are Your Ears? (Hearing Test) (Sine wave glissando from 20 Herz to 20,000 Herz) | |