Interference in Music Type of Activity: demonstration Purpose/Objective: demonstrate constructive and destructive interference, beats, and dissonance Physics Topics: waves and sound Maths Topics: N/A Tie-ins: assonance and dissonance (music) Materials: Procedures: Teacher Procedure Find a common song that the students know (national anthem, Happy Birthday, Row Your Boat, etc.) Make sure all students know the song and can sing it together Explain the procedure and help them practice Student Procedure group of students Help the teacher choose a song that all know and can sing easily One student begins to sing the song. At <a href="/keyword/regular-intervals/" >regular intervals</a> , others join in. All sing in unison. The increase in volume indicates constructive interference. All students sing a bit differently in time or pitch. Note the variations in volume, which indi...