deviation and control of tone

Hi there, I would like to know how to show in audacity the deviation of a produced tone.
I.e. A saxophone player produces a constant tone ‘a’ (440Hz) which can be recorded an shown in the waveform. Normally the a player can not produce this tone over time with absolute constant 440Hz.There will subtile deviations up to 445, or down to 435 etc. Is there any possbility in audacity to make this deviations around 440Hz visible? I use: OSX 10.13.6 high sierra; Audacity - thanks in advance - ullrich

Here’s a sine tone that has a nominal frequency of 440 Hz, but modulates at 1 cycle per second between 438 Hz and 442 Hz.
The spectrogram settings are shown below.
(more info about track spectrogram view: