[Raynor]

In the BoLT version, the entering of evil in the first theme is even clearer:

There [in the dark places] had he nonetheless fallen to thinking deep cunning thoughts of his own, all of which he showed not even to Iluvatar. Some of these devisings and imaginings he now wove into his music, and straightway harshness and discor- dancy rose about him, and many of those that played nigh him grew despondent and their music feeble, and their thoughts unfinished and unclear, while many others fell to attuning their music to his rather than to the great theme wherein they began.

In this way the mischief of Melko spread darkening the music, for those thoughts of his came from the outer blackness whither Iluvatar had not yet turned the light of his face; and because his secret thoughts had no kinship with the beauty of Iluvatar's design its harmonies were broken and destroyed. Yet sat Iluvatar and hearkened till the music reached a depth of gloom and ugliness unimaginable; then did he smile sadly and raised his left hand, and immediately, though none clearly knew how, a new theme began among the clash, like and yet unlike the first, and it gathered power and sweetness.