They shouldn't be in the Song of Arda.
And although the three melodies were of a completely different composition, which would otherwise never intertwine with the First of his Songs, He does not immediately return them to the Song they belonged to.
They shouldn't be in the Song of Arda, but now that they are, He can't help but admire how his Children, whatever Song they are in, can be the source of so many wonderful, beautiful things, and whose love and pain could heal even his creatures who would have been lost forever otherwise.
So The Maestro rearranges his orchestra, satisfied and full of contentment for all his good work, one that would ultimately bring him glory, honor, and love.
Manwë watches as a strange portal rips through Arda. He watches it with bewilderment and wariness. As attuned to the world as he is, the power he feels almost makes him wonder if one or more of his fellow Maiar have descended to the First World after so many ages. But what he sees are none of the Maiar. He sees four Children of Eru, humans.
He narrows his eyes, then recognizes in one of the children, the fragment of the Essence that had been lost over 3400 years ago.
"How is this possible?"
It should not be possible to separate the Essence itself, something the Maestro himself had done, and then place it in the body of a Child of Eru. None of their physical bodies could contain the Essence, not even the Firstborn.
"It was allowed."-He thinks amazed when he asks Eru for advice. Eru gives him instructions about the new inhabitants of Arda, and the old one in a new body.
Even though he understood the Creator's plans the most, he could not see what purposes would be achieved through those four. He did not question His wisdom, however, more curious and expectant than suspicious. Illúvatar's plans were beyond his ability to comprehend, but that was what made Him so evidently the One, the being worthy of glory.
The Creator conceived that world through the Song, and however many ages passed ruling and caring for the world that Eru allowed him to manage, he still had surprises in every age. It was a truly breathtaking thing, that after so many ages, victories, discoveries, and even heartbreaks, the novelty never ceased. There was always something wonderful that Manwë had not noticed during the vision of the world forming.
He meets with the Powers of Arda, to communicate Eru's guidance regarding Arda's new inhabitants.
"Since these Children of mine were created for another Song, their souls are capable of different gifts from those Kids I created in my first world. Because of this, they are greater in power than Men and Elves, though not greater in longevity than the Secondborns. Because they were forcibly taken from their Song, I will allow them to choose their fate to have the gift of Men or the longevity of Elves.
Three were forced out of their own Song, but only two will be given the choice offered to half-elves, at an appropriate age.
She who, out of love and imprudence of a Maiar without his memories, was imposed a burden that did not fit her kind, will suffer great agony for the glory that was taken from her, but she will find rest and peace in the halls of Mandos.
He who has mutilated himself in his arrogance and despair, and nullified my child's blessing, will be given both punishment and redemption. He will find love, but only for a short time, and he will only fully enjoy it after long ages of atoning for his evil deeds.
This is my sentence about my Children of another Song, and about Mairon, who brought this change in their destiny."
The Powers Council extends presumably to somehow alert the Powers' favorites. Eru may have granted permission and given him instructions, but they were still dangerous to the fate of Middle-earth. But Námo did not stay at the meeting; he had a duty to perform and would be the first Valar to meet one of Arda's new inhabitants.
He transported his Essence to the spot where one of the children was and his eyes roamed the desert land until they found the familiar silver glint of a soul.
She was standing, watching her body on the floor, her expression surprisingly neutral for someone who had died. Námo approaches and stands beside her, without speaking, and waits.
He never speaks first. Souls always recognize him as the guide, which he is always grateful for, as there are no words that would be adequate to explain the last journey, even if in her case that last journey was just a palliative. Though she was from another Song, and her guide should have been another, she still recognizes him as her guide.
"Will they be okay?" – It is her question, after a prolonged silence. It wasn't an unusual question, and he was usually as sincere as he could. In her case, it would be no different.
"This Song… this world is not like yours. They will have the choice to live a long life, returning to this world even if they are fatally wounded. But I cannot say what choice they would make, or whether they will be happy if you decide to leave."
"If I decide to leave? I am dead; there is nothing more to decide."
He shakes his head sadly.
"Death is not permanent for you, Kana Uchiha. Someone took that gift from you."
She gazes at him, her eyes never leaving his, unlike most mortals he's encountered, but no wonder she's staring at him so intently, not after what he's said and all the implications of it.
"Will I not die? Never? So what will happen to me? Where will I go if not to my final destination?"
Her voice is just a whisper and there's a quiver in her translucent lips.
"Eru has granted me permission to take you to my halls; you will find rest and peace, although you will never reach the fullness that was reserved for you as a human. Once you decide to live there, however, you cannot return to Middle-earth. And it may take ages to find these children again."
"So, can I take a peek before I make my decision?"- She tries to smile, but he sees very well the desperation that is developing inside her.
"I could arrange that. Walk with me through Mandos and then ponder your decision."
"What if I choose don't live there?"
"You will wander through this world, alone, never able to ease the agony of eternity."
The young woman closes her eyes, shaking her head and hugging herself.
"Will I meet my parents in their halls?" – She asks, a thread of hope.
"Ah; they died too." The Ainur infers from her question, and wonders if it would be possible for her to meet them again, at some point. Eru's plans were unknown to him, but he suspected that, in the future, all of his Children might be reunited, after The Final Battle; it would still be a very long time until that day, however. And it wasn't even a certainty, just a possibility.
Námo feels sorry for her; Kana might never see her human loved ones again, and even if it were possible, after The Battle, she could not partake of that happiness that only the Secondborns were gifted with. It would hurt, perhaps, much more to live among them with the certainty that she could never achieve that blessing.
"No. There is a possibility of seeing them in the future, but it is uncertain and I advise you not to look forward to it; even if you find them, it can bring you more sadness than happiness, for whenever you see them, you will also see how you should have become if you still had your blessing."
The Valar would not have judged her if she had cried; she doesn't, however, and he feels even more compassion for her, for there is a resignation that could only be acquired by someone who no longer expected anything good in their life. As if all that terrible news was something she'd been waiting for.
As if she deserved it all.
"I don't want to leave them. And I don't think I'll find peace in your halls, not when there's no one for me there. I... I don't know what to do." - She sighs, looking at the horizon, absolutely lost.
"Don't leave them, then." - He tells her, putting a hand on her shoulder. She shivers at the contact and his heart sinks at her reaction, having seen too many wounded souls who had the same difficulty accepting comfort. It was always painful to see these ones. – "Take care of your family, until you are ready to leave. The option will not close for you, Kana. I'm not making a one-time offer; you can enter the halls of Mandos at any time you wish. Besides, I'm sure you wouldn't be alone in Mandos; the inhabitants there would definitely be delighted to make friends with you. Being the only human would attract a lot of curiosity, after all, and they'll make sure you feel welcome."
He removes his hand from her shoulder and smiles as she looks at him gratefully.
"I'll stay here for now. Next time we meet you will show me these halls of yours, sir..."
"Call me Námo."
She crouched down until she was just inches from her body, almost touching herself as if she instinctively knew how to return to her own body.
"One last question... Will I remember this?"
"I don't know. Usually, elves and dwarves can remember, but they enter my halls before returning to life."
"Mnn." – She mumbles and then nods. – "Well then. See you next time, Namo."
The Valar watches as her soul returns to her body, the translucent silver fading within her mortal body.
It's a little less than three years when he finds her again, this time her body not bleeding to death, but completely deformed and crushed. Wreckage of the Tower of Isengard, some ruins still standing, but it's a scene of destruction, especially when he remembers what a place full of life, fauna, and flora was before. And, in the ground, there was a deep crater where they fell.
She died to protect Mairon, he notes.
"How much love, for the one who took away her gift." Námo thinks but keeps to himself. She didn't know who had done it, and she shouldn't know until it was time for it.
"Námo."
She greets him and he nods in greeting, hovering beside her, as he had last time, both of them looking at her body, and the stunned boy above her.
"Hello, Kana."
As usual, he waits for her to break the silence. It doesn't take long this time.
"I didn't remember, until now." – The young woman began, running a hand through her hair, even though in her spiritual form there was no sense for such an act. She sighs. "I'm so tired, Námo. So, so tired."
He extends his hand.
"Perhaps you can glimpse a little rest. Walk with me?" - She hesitates, looking at her brother.
"Time passes differently there; at most a few seconds will pass if you go back.
She accepts.
Námo took her to her possible home, and Kana had never seen a more beautiful place. It was full of light, beautiful voices, and a distinct feeling of warmth. It was everything an exhausted person could dream of, and more. People (mostly elves, she realizes) were one reason for this sense of peace, for everyone was in harmony with one another. She is grateful that none of them seemed to see her, as she doesn't know what she would do if they actually got as curious as Námo seemed to think they would.
It was… too much light for someone who had thrived in the shadows. She longed for that light but was afraid of getting burned with it. Perhaps with time, that would change; and she would have plenty of time.
"What do you think, Kana? You said you're tired. Here is a place to heal your weary soul, if you desire so."
And for all the desire and delight she showed when he walked with her in the halls, Námo knew Kana would not choose rest. Not yet.
She opens and closes her mouth a few times, rubbing her chest frantically.
"I want to. I really, really want to. But as much as I need rest... I need them more."
Námo nods, understanding, and they return to the place where she died for the second time.
He is as surprised by the scene that greets him as the girl next to him.
It turns out that within a few seconds, her two brothers, for whatever reason he can't comprehend, were in a fight that looked quite lethal.
"Oh, come on!" - She complains, pinching the bridge of her nose.
"There is still time to choose rest."
"Rather than yours highly stress-inducing siblings." It is not said. Kana snorts.
"Another time. See you in my next death, Námo."
"See you, Kana Uchiha."