1. Chapter 13: Sound & Music

2. Pitch and Rhythm Pitch Rhythm Pitch: how high or low we hear frequency Pitch 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

3. Consonance & Dissonance Consonance: a good combination of sounds Dissonance: combination of sounds is bad or unsettling Which video shows consonance and which shows dissonance? Video 1 Video 2

4. Echolocation Bats use ultrasound waves to “see” at night A bat will “chirp,” and the sound reflects off of objects in the path of the bat The bat’s ears will hear the echo when objects are in the path of its “chirp,” at a slightly different frequency The frequency depends on how far the bat is from an object

5. Harmonics The note “C” played on a guitar will not sound the same as a “C” played on a piano They 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