Sometimes the artist credit used for a recording itself may be different from the artist credit used for the recording as it appears on the tracklist of a release.

For example, http://musicbrainz.org/recording/c5bfeacb-1d94-492d-ac73-ecd28a782ab1 notes that the recording is credited to "木之本桜 (丹下桜), 大道寺知世 (岩男潤子), 李苺鈴 (野上ゆかな), 佐々木利佳 (川上とも子), 柳沢奈緒子(本井英美) & 三原千春 (松本美和)", but not that on release http://musicbrainz.org/release/2c0f10b0-c7de-48e8-9d9b-5ae416441c67 it is credited to "Sakura Kinomoto, Tomoyo Daidouji, Meirin Li (Yukana Nogami), Tomoko Kawakami, Emi Motoi & Miwa Matsumoto".