Shinhwa songs: Wild Eyes, Perfect Man, Chaos, Gido (Prayer), Desire, Eusha Eusha, Hey Come On (I have this one in English, oddly), Only One, TOP, and Yo. Shinhwa's music is pretty diverse if you listen to all of the above.

I used to listen to dir en grey for study music. Pretty much anything not in English is good study music for me. At work, I'll listen to kpop all day long.

I have such varied tastes in music, it's cool. Pretty much any kind of music, I know at least one or two artists and some of their best songs.