Just realized this, blew my mind, needed to share right the heck now.
So in the
Touhou PV of Kachou Fuugetsu, when the chorus starts we see Lady Yukari, Lady Yuyuko, the goddess Kanako, and Lady Eirin. Now at first I didn't think much of it right? Until sometime after I did a little research.
Kachou Fuugetsu is a Japanese Idiom that means "Experience the beauties of nature, and in doing so learn about yourself" ...more or less, and is made of the Kanji that mean Flowers (Ka), Birds (Chou), Wind (Fuu), Moon (Getsu).
You can see where I'm heading with this right? Well, lemme finish off then.
It turns out that each of those four Elder Residents of Gensokyo are related to the idiom, and plus, their appearance is timed to each kanji.
Ka: Lady Yukari -> One way to read "Yukari" is "Violet", there happens to be a species of flower called Violets, plus she is also close friends with Lady Yuyuko...see below.
Chou: Lady Yuyuko -> Now, this one is a bit of a stretch, but it's the only explanation that makes sense here. The kanji happens to be a homonym for "Butterfly", and not only does she have a HEAVY amount of butterfly motifs related with her, but the insects are traditionally related to death itself, plus her close relationship with Lady Yukari brings to mind the close relationship between flowers and butterflies.
Fuu: Goddess Kanako -> The Wind Goddess.
Getsu: Lady Eirin -> Descended from the Moon.
That's not all though, towards the end of the PV, the idiom is sung once more, this time to the images of Marisa, Reimu, Sanae, and Sakuya in that order, with the same pacing. Other than Sanae and Sakuya, whose associations are clear, even if Sakuya's was implied rather than stated outright, I'm not sure about Reimu or Marisa. Still trying to do research on that, but nothing's turning up.