User blog comment:Pihou/VOCALOID Piano Songs?/@comment-24840832-20140620130504

Haha, well Hirari Hirari is the first thing that comes to mind. Thanks to Umbreon for the recommendation, didn't know that one, yet.

Well, Magnet is rather piano based.

I played the piano for years and somehow I still consider it very possible that I might list songs that aren't actually piano because I'm stupid like that.

No More

AkiGlancy tends to use piano in her songs rather heavily (for example White Knight and Sunflowers in Your Eyes).

Shinigami Record (I like the song and Jin but the tuning isn't really my thing in this one. I think it should fit, though)

Not sure if it counts but Meteor, maybe

Can't I Even Dream? (I think this was made by the same person who made No More)

I hope that helped at least a tiny bit? I might add some more later (if I find more). Good luck :)