Back to alphabetical overview – click here
Hertz (Hz) – Definition
Hertz (Hz) is the unit used to measure frequency. In music, it describes how many vibrations per second a sound wave produces, determining the perceived pitch of a note.
What is Hertz?
One hertz equals one vibration (cycle) per second. The higher the frequency, the higher the perceived pitch. For example, the international concert pitch A is standardized at 440 Hz. Doubling the frequency to 880 Hz produces the same note one octave higher.
Hertz is fundamental to musical tuning, acoustics, and audio engineering. Every musical note corresponds to a specific frequency, allowing instruments to be tuned accurately and consistently.
How is Hertz used in piano playing?
Pianists rarely think about frequency values while performing, but Hertz plays an important role in tuning. Acoustic pianos and digital keyboards are normally tuned to the international concert pitch of A = 440 Hz, ensuring they blend correctly with other instruments.
Hertz is also widely used in music production and sound engineering. Equalizers (EQs), filters, and other audio processors use frequency values in Hertz to shape the tonal balance of piano recordings and live performances.