There are quite a few by soffia here
There's a lot of great ones by sango here
Pandalolii has quite a few here
Ekko has a bunch here with collaboration work too
Fukkireta youtube link
Torinoko City here
Finder here
Heart Beats here(with off vocal)
Catallena here
Common world domination youtube link
Ai no uta (愛の詩) youtube link
More will be up as I find the links!