I am aware that it is purely a product of Show IWTV, and really it's such a minor element but...
I really want to know more about that music box.
Lestat says he composed the song for Nicki-- does that mean he had the music box made for Nicki? Or did he make the melody and only made it into a music box after the fact? Was it originally a song that Lestat would play on the piano for Nicki?
When the music box/piano song was made for Nicki, at what point in time did Lestat show him? Did Lestat do so nervously or excitedly? What was Nicki's reaction, being a character who seems to value music very much as a way to express emotions, is music a love language of his? Lestat, who cannot write poems or love letters, made a singular repeating melody for him.
If it was music box, a small sign that someone loves him that can be kept in a box. Even if Lestat is not there, he can listen to it. When he is feeling cheerful, depressed, overexcited, or all the other in-betweens Nicolas might feel, he has the song to keep with him.
Did Lestat commission a music box it for Nicki during the era of disappearance, when he was sending him very expensive gifts... preserving a piano melody he used to play... Did Nicki listen to the music box during the era when Lestat had vanished to fill the space of loneliness and silence...
Did Lestat try and play the music box after Nicki went catatonic, in a feeble attempt to try and release him from that state...