Sound = Waves Disturbing Air Molecules

Molecules bunched together

- compressed

Molecules farther apart – lower

pressure

For sound waves, frequency = pitch

Things start to add up

Constructive Interference

Destructive Interference

“Locked-in” waves amplifyCompeting waves cancel each other

fundamental

•Harmonics

Pure tone: A4 440 HzClip 2

Vibrating string tone: A4 440 HzClip 3

Harmonic Frequency (Hz)

Fundamental 220

1st 440

2nd 660

3rd 880

4th 1100

5th 1320

This is why there are a lot of octaves in Barbershop arrangements

Harmonic Number

Singer #1 Frequency (Hz)

Singer #2 Frequency (Hz)

Fundamental 220 440

1st 440 880

2nd 660 1320

3rd 880 1760

4th 1100 2200

5th 1320 2640

Look at all those octave intervals and ear candy possibilities

Part Note Fundamental1st

Harmonic2nd

Harmonic

BASS A 440 880 1320

LEAD E 660 1320 1980

Watch Clip #4

Lots of anatomy

and mechanics

involved

Wave Form Harmonics

Tongue, lips, soft palate position alter the resonance cavity.

This alters theresonators which filters out oramplifies certainfrequencies.

Hard work but awesome fun when we get it together.