First art was drawn under the impression of "Background pony" (www.fimfiction.net/story/19198/)
And of the song "Cold" about Lyra (https://tabun.everypony.ru/blog/Poetry_blog/171100.html)

*I'll amuse them at the balls.
I'll sing to them at the feasts.
I'll become the song in their hooves.
I'll become the song in their hands.
I'll become their harmony and peace —
Heart Strings. Or Lyra.*

The second — "Non-background pony: A Song of Twilight" ([ponyfiction.org/story/14286/](https://ponyfiction.org/story/14286/)) It is fanfic to "Background pony", only in russian as i know.