Hard RK and Soft LM mixes

[minahakuba12345]

I was just poking around Nico Nico when I found some nice mixes:
Hard RK mixes ("Hard" Rin Kagamine)
and Soft LM mixes ("Soft" Luka Megurine).
Hard RK mixes feature Rin singing in a squeaky, fast way to an arrangement of a song.
Soft LM mixes are Luka singing in a dreamy, sweet tone to a fitting arrangement.

CosMo/Bousou-P seems to have invented the idea. (His Nico Nico Mylist)

Soft LM mixes:
Melt
Nico Nico link.
YouTube link.

Hard RK mixes:
Meltdown
Nico Nico link.
YouTube link.

Just Be Friends
YouTube link
It's not on Nico Nico Douga, I think.

Discuss this and other similar remixes and covers.

By the way, I have not been here for a long time. I took a break from Gaia.