So yeah, I spent like 3 hours a few days ago just going through a bunch of Vocaloid songs on youtube and they've really grown on me. I usually listen to Hatsune Miku, but I am open to any Vocaloid song.
Here are some that I already like:
Hatsune Miku-
That One Second in Slow Motion
Miracle Paint
Love is War
World is Mine
Ikutsu Mono Yoru o Koete
Joker
Romeo and Cinderella
Gumi-
Sorry to You
I also like covers of existing songs, like Kagamine Len's cover of Tori no Uta so those are cool too. Thanks!