I was thinking if it is possible to create categories for songs that feature vocals from somewhere other than VOCALOID as a guest. Examples of this are 驫麤～とりぷるばか～ (Triple Baka) & 歌姫の詩 (Utahime no Uta). They feature UTAUloid Kasane Teto. This can also be applied to songs like 作曲するならいまのうち！ (Sakkyokusuru Nara Ima No Uchi!), as it features CeVIO's Sato Sasara and VOICEROID's Tsurumaki Maki. Should this be possible, or is it better to avoid risking non-VOCALOID character get all the attention?
I have three songs for you to add. They are:
White Chritsmas vocaloidlyrics.wikia.com/wiki/ホワイト☆クリスマス_(White☆Christmas)
Sekai ni Todoke Winter Chorus
Ginsekai no Miracle Chorus