Pitch is a property of sound perceptible to the human ear. Pitch depends on frequency, i.e., the number of oscillations of the medium (usually air) per second that act on the eardrum. The higher the frequency, the higher the sound. For example, a hum is a low sound; a squeak is high.
Each note has its own frequency. For example, A4 (A¹) = 440 Hz, G4 (G¹) = 391 Hz, and so on. Strictly speaking, all sounds have a frequency, but, for example, a sound with a frequency of 385 Hz is not a note because no note with that frequency exists. You need to add 6 Hz for the sound to become G4.
Like any instrument, the saxophone is tuned to the piano or a backing track with A4 tuning, commonly at 440–442 Hz (the tuning fork has the same frequency).















