According to a legend*, the pottok inspired the creation of the txalaparta, a Basque instrument. The sound of the sticks hitting the planks is reminiscent of the sound of a horse's gallop. Here is a video so you can hear the sound (with a nifty Basque chant around 3:20. Subtitles in French explaining more about the instrument and its uses/history).
I hear in my heart,
I hear in its ominous pulses,
All day, on the road, the hoofs of invisible horses.
~ Louise Imogen Guiney, from "Wild Ride"
Since the dawn of civilization, the horse and the Muses have been boon
companions in all the heroics of mythology and history. ~ Robert Frothingham
* There is no consensus on the true origins and uses of the txalaparta. As for the name of the instrument, according to Wikipedia: In Basque, zalaparta (with [s]) means "racket", while in the nearby areas of Navarre "txalaparta" has been attested as meaning the trot of the horse, a sense closely related to the sound of the instrument.