ohh i have a great number of favorites but i think my answer to this is always gonna be sing the moon by tsukuyomi solely bc of emotional attachment LOL.

i could also list you harugohan's entire discography or tsukuyomi's. or redire. or-- yk i can keep going. i spend the majority of my day every day listening to music so its hard to be like "i love THIS ONE! the most for SURE!" cause i hear so much shit all the time and i go through days where i listen to just one song over and over