Element # 2: Register (high and low)

Episode 2.1 in a series on the fundamentals of music. 

0:00:00 - Register (1st aspect - Pitch Level)

0:16:15 - Phrase and period versus register 

0:36:46 - Register (2nd aspect - Octave Equivalence/Pitch Class)

0:44:45 - Register-sensitivity/Register-insensitivity - extra-musical effects and imagery/melody

0:51:40 - The condensed 'hypothetical' octave in the memory

0:55:10 - The 7 octaves (C1-C2, C2-C3, etc.), and SATB (Soprano, Alto, Tenor, Bass)