I felt tat HandMC, or known as HIGH and MIGHTY COLOR's songs r nice, especially 遠雷 ～遠くにある明かり～ and 背徳の情熱.
Toki no Namida by UVERworld, MIRACLE by ORANGE RANGE and IDentity by Nami Tamaki oso nice
As recommended, God Knows... by Hirano Aya r the best
EMOTION by Rie Tanaka and oso ENDLESS STORY by Yuna Ito kinda good too .

All in all, there's too many japanese nice songs out there...n...oops, is tis thread only meant for anime songs???