When considering the role of the Great Music and the origin of Orcs, it is important to remember that Eru alone sang the Children into existence. The
Silmarillion says:
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For the Children of Ilúvatar were conceived by him alone; and they came with the third theme.
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That means that Melkor could not have conceived of living creatures at that time; Aulë made the Dwarves later in memory of the vision and was given life for them as a special grace. I cannot imagine anything similar happening for Melkor.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth..
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