Let's look at different instruments playing the note A 4. But why is this the case? We're playing the same note – making sound waves with the same frequency – so why doesn't it sound the same? ![]() If we play the same note on two different instruments it will sound very different. Why do different instruments sound different? A note an octave above has a frequency of twice the original note. For example, the note A 4 (the A above middle C) has aįrequency of 440 Hz, meaning the instrument is vibrating 440 times per second. The higher the frequency the higher the pitch of the note. Means the number of wave cycles per second, measured in ![]() The instrument is vibrating at a certain frequency, which
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