1. You always know what you hear  Unless you are tone-deaf, you can tell when a note is played higher or lower than other.  Or can you…  Like there are optical illusions, there are also auditory illusions (and I do exploit them as a composer).  One of the most important concepts in music theory is the harmonic series. Essentially, whenever you speak or make a sound, there is the fundamental pitch that you hear as well as many pitches above that pitch resonating that the same time. These other pitches give sounds their unique qualities and timbres.  There is a phenomenon called the missing fundamental.  If you were to take all these upper pitches from a note and remove the fundamental, you would still hear the fundamental.  This can make notes sound like they are rising even if they are falling. Or can make you hear notes that aren’t even playing. Or chords that aren’t present.    One great resource to learn more is auditoryneuroscience.com. There, you can test yourself amongst actual samples and see if…