This is probably just coincidence but there is a reason I occasionally refer to Lyra as a Bard and it's more than just because she has a Lyre on her flank. I prepared this when doing a presentation on My Little Pony: Friendship is Magic and Indo-European Mythology. Again this is maybe coincidence but it's always stood out to me.
Anyways in Figure 1 we have Lyra Heartstrings. Figure 2 is the Awen symbol, Awen is the Welsh word for inspiration and often poetic or musical inspiration. It was invented by Edward Williams (aka. Iolo Morganwg) and is often used as symbol for gorseddau in Britain and used by such groups as The National Gorsedd of the Bards of the Isle of Britain and The Cornish Gorsedh as well as Meso-Druidic and Neo-Druidic Groups. The gorseddau are big promoters of traditional literary scholarship, music, and poetry. As seen in Figure 4 they typically wear a shade of blue as a traditional Bardic color (the National Gorsedd of the Bards of the Isle of Britain having an interesting shade for this discussion). Finally compare the Awen Symbol with Lyra's Cutie Mark (Figure 4) and notice how it very much resembles the three line Awen Symbol put into a Lyre or Harp. It's probably just a coincidence but its always looked like it to me.