Notes and octaves in Hertz This table will be useful for you when using an equalizer. If a song is in, for example, C major, you can see the frequencies of the notes in the table. Convenient, isn’t it? The table provided has been prepared so that the pitch A1 is 440 Hertz. This is a common standard, but there are also other tunings available. For example, wind instruments are often tuned so that A1 = 442 Hertz. However, this accuracy is certainly sufficient for the use of an equalizer.