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→Harmony
==== Harmony ====
The result of combining multiple pitches simultaneously (or giving the same effect when playing them in sequence). This expands into the study of sequences or progressions of multiple pitches, often using roman numeral analysis, with diatonic chords falling into specific harmonic functions. See [[Music Theory Basics]].
==== Impedance ====
Electrical resistance to an alternating current. Direct current circuits amount of current is limited by the voltage of the power source and the resistance of the circuit. Similarly, impedance determines the amount of current flowing in an alternating current. Where the two concepts are fundamentally different is that impedance is variable depending on frequency. Normally, devices will have a resonant frequency where the impedance is least around a certain frequency, allowing a stronger flow of current at that frequency, while frequencies above the resonant frequency has increasingly high impedance and roll-off high frequencies.
==== Interval ====