In my case depends on the band/singer. There are bands that I like just for the music and others that I started liking them for the performers and at the end I also like the songs.

I've never been one of those to buy all the works of one singer/band until I started liking SMAP. I don't have all their discs but I have lots of them. After that I do have some works of some other bands but nothing like that. After SMAP that was also my first I went to TOKIO and before I could notice I went into kpop and later on discovered Yamapi (but mainly his solo work) and now Arashi. I also like some V6 songs (especially one called Guilty).

K-music, I really like dance-type songs. Ballads I only like Jo Sung Mo, for now, ss501 have some nice ones too. I prefer happy kind of music... ballads tend to make me nostalgic and probably a bit sad.