Orcs creation theory

[Estelyn Telcontar]

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:

For the Children of Ilúvatar were conceived by him alone; and they came with the third theme.

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.