A great example:
Us and Them - Pink Floyd
https://m.youtube.com/watch?v=s_Yayz5o-l0
The speaker connected to the organ is possibly a Leslie. With its rotating reflector and counter rotating tweeter horn it creates frequency modulation caressing listener's basilar membrane.
A very nice effect can be created by rotating a small speaker inside its small open back cabinet hanging by the cable itself. At your risk. Take all safety precautions. See also the Pleiades (rotating) speaker.
See also:
https://en.m.wikipedia.org/wiki/Doppler_effect
Conceptual Physics - Hewitt
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