Well, for you Morning Musume / Tsunku / Hello Project fans, there's an interesting television program that does this:
Selected members of Hello Project (and some other guest performers, by the looks of it from other episodes) sing one song each episode (?) that are songs from the past. Each week has a theme and the song is selected to adhere to that theme. Just thought you guys might find it interesting to see girls from (or whom have graduated) Morning Musume singing songs that are not customary to their "usual" style the general public is accustomed to.
Also, note for all y'all who think J-POP is all about yappy, happy go lucky chick tunes (as in Morning Musume):
Not all Japanese music is "Pop-ish," some can actually sing. This is a song called "Winding Road," a collaboration performance between Kobukuro (the two male singers, for those of you unfamiliar to them), and Ayaka.
Jam it back in, in the dark.