Board Thread:Wiki Discussion/@comment-35301431-20140327204149/@comment-3467648-20140710160816

Really I don't think we should do too drastic changes about the matter, as the mentioned cases are more an exception than anything else. Let's see:
 * Migikata no Chou: Both versions are treated as independent songs although both are the same, different slightly in the melody (Len's version is the one who is featured into the games, concerts, but Rin's version is the only one who got a proper PV). However, as both versions reached the 1M of views independently, there's no conflict with the categories.
 * Akahitoha: Originally a Miku's song, however the song reached it's recognition and popularity after Luka's release, which is a more "finished" version when compared with Miku's. All the related merchandising and promotional material is about Luka's version.
 * Turkish March - It's Over ＼(^o^)／: Similar to Migikata no Chou, the only difference between "Turkish March - It's Over ＼(^o^)／" and "Super Turkish March - It's Over ＼(^o^)／" is the addition of the soundtrack and some SFX from Mario's games. Both songs are the same and there's no category conflict as both have reached the million of views.
 * PoPiPo: None of the self-covers have reached big popularity. Again, I don't see conflict with the categories.
 * Rain of Dreams: It would be the only exception, as there's a confusion in which version is the original one.

The other cases like Cendrillon/Adolescence, were covered with the introduction of the Spin-offs category.

IMO, it would be better determine each case independently, instead apply another category which it seems will only confuse the situation further more.