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S tier songs have themes I can connect with very well, great musical backing, and a sense of their singers pouring their heart into them.
A are the same except I don't relate to them so well, and/or the non-vocal work on it carries them. Sparks is great, but I don't think it's Kiara's magnum opus even if I really like what she sings about.
B are in some segments as great as A, but I don't care as much about them in terms of lyrics, except for CN where I feel the lyrics tend to be great, everything else is fine but not amazing.
RIP has a backing track that is over-the-top, Heart Challenger is cute but >Valentine, and I never got invested in Live Again even when I have no particular reason to dislike it.