13.3 MusicChapter 13: Sound & Music

Pitch and RhythmPitch RhythmPitch: how high or low

we hear frequencyPitch and frequency

mean the same thing, but can sound different

Pitch is affected by the sounds you hear before and after

Rhythm: a regular time pattern in a sound

People respond naturally to rhythm – many cultures use it

Consonance & DissonanceConsonance: a good combination of soundsDissonance: combination of sounds is bad or

unsettling

Which video shows consonance and which shows dissonance?Video 1Video 2

EcholocationBats use ultrasound waves to “see” at nightA bat will “chirp,” and the sound reflects off

of objects in the path of the batThe bat’s ears will hear the echo when

objects are in the path of its “chirp,” at a slightly different frequencyThe frequency depends on how far the bat is

from an object

HarmonicsThe note “C” played on a guitar will not

sound the same as a “C” played on a pianoThey have the same pitch and the same

frequency, but the instruments change the way the sound is heard

Each instrument has its own recipe for sound, even your voice