Noise from motor run by PWM

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Hi! My friend design a motor controlled by PWM, the frequency is 100Hz, but he don't like the noisy when motor is running, do you think of anyway that stop this noisy ?
And a small question, do you know any IC that allow you to load a song and play it ?
Thanks !!!
 

100 Hz PWM is a very low frequency. It is possible to obtain much better results increassing PWM frequency ( i.e. 10KHz ).
 

Hi ! But I been said that increase frequency too much also not good ? Is that right ? Why ?
Thanks !!!
 

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