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Guys, this is all perfectly normal.
The "music" is produced by microstepping (audio frequency current produced by PWM, which then rattles the motor windings) and it may be additionally amplified by the telescope tube acting as resonator (I had that experience with my bartelized dobson... the vibration coupling was actually so strong that it significantly affected the image under certain circumstances, so I had to add absorbers on the spider vanes to eliminate it).
BTW, my classic EQ6 (no synscan or goto or whatever, no microstepping used)) is perfectly silent, I can not hear it at all (nor can my daughter, and she has almost un-naturally sensitive ears). But, this may be because I still do not have my newtonian mounted on it.
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