As a general rule, as with everything else on VocaDB, information that is already provided in one way usually does not need to be repeated in other ways.
Original songs ( "オリジナル曲" in Japanese) are songs that are completely original content and aren't based on other songs.
Note that on VocaDB self-covers and self-remixes, made by the artist him/herself, are to be classified as covers and remixes, not "original songs", unlike on NicoNicoDouga.
Instrumental song that is an original, meaning it's not an instrumental versions of some other song, should be classified as original song, not instrumental. Instead, you should indicate that the song is an instrumental by using the instrumental tag.
Sometimes producers upload "modified versions" of their older songs. 修正版 in
title usually indicates that it's remastered version. If the original version can not be found (deleted) or it's not in any album, song should be original song type instead of remaster . Sometimes whole album is made of remastered songs. In this case, mentioning it in the album description or/and using a tag is enough.
Currently arranges should be classified as a remixes.
Sung by human (utaite) / Vocaloid cover / Instrumental cover. Since 17th August Utaite covers has been prohibited (For more info visit VocaDB FB Page ). If producer has two or more identical songs with different vocalist, the first upload should be original and other songs should covers with Self-cover tag.
Instrumental song type should
only be used for instrumental versions of the songs, released within some album. If the song is original song and has no vocals, use instrumental tag (Only when the song is part of album in the db). Nicokara (ニコカラ) songs and other non-offical karaoke songs should not be added to database. Karaoke download (piapro links) in the song entries are allowed. Instrumental songs using Vocaloid/Utau voicabank as a chorus should be Original song type, with a supporting vocalist role.
Mashup Mashup = Song or composition created by blending two or more pre-recorded songs. Currently it's not possible to specify more than one song as the "original" one ( Issue 59 ). Remember to mention both songs in the description.
In most cases Drama PV is animation story made with MMD. In most cases unrelated to music (excluding background music).