A well written bittersweet piece.  I like the distinct personalities of Elros and Elrond here and Maglor's musings were touching, especially when he recalled the third kinslaying and his arguments as to what made a Kinslayer. 

What  a wonderful piece and I love your interpretation of the quote from the book. I don't think its that easy to capture the 3rd kinslaying with all its concequenses - be it political or emotional - in a short piece, but you did a marvellous job with it. To me it reads that during this idling song, Maglor also deals with upcoming thoughts and realisations - just as the notes fill the room in a graceful manner. As little may be thought, yes he did try to love both kids, no matter if Elros turned him down, no matter how the inhabitants of Sirion thought of him and his family. I just feels to me that by taking in the children, he searches for redemption but this line - Or was there some sin that Maglor had forgotten, some justification from the curse that robbed him of all those he loved?- gives voice to his doubt if he ever will. However, forgive me if I read to much into this, he seizes the choice (a boon denied before) to at least try and make amends angry elfings or not.

I found this immensely touching and thoughtprovoking in a very lyrical way. Thanks for writing and sharing this!