I know this is an old topic, but I add this for anyone who might stumble across it.
With chaos magic, in my experience, the question 'Can I do this?' almost always has the answer 'why not?'
As for what you're talking about, it's actually one of the techniques that was used on me(and now used by me) whenever I was first getting 'initiated' into magic. One of the big problems people have is overcoming the 'Magic Isn't Real' barrier. And it is a hard one to overcome. But they're already interested and probably want to believe, so they make a sigil, but lust of result gets in the way.
Whenever someone else(a trusted someone else) designs the sigil based off the other person's intent, it helps distract the initiate magician from the original intent, weakening lust of result and allowing them to concentrate on the sigil itself. In this way the magic works faster/better and helps to show the initiate magician that Magic Works!
Also, sometimes me and the (few)occult friends I've had will design each others' sigils just as a gift, or a way to stir things up.
However, if you feel confident that you can sigilize your intent via music, then you should definitely go for it. Nothing is True. Everything is Permitted.
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Let us step out into the night and pursue that flighty temptress, adventure.
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