i tag according to the official tracklist. capalizations, kanji, you name it. i'm a strict tagger, if i say so myself.
for example,
ARTIST | SONG | ALBUM/SINGLE
LANDS | 二十歳の戦争 | Olympos
i use kanji/hiragana/katakana even if i don't know the meaning of it. LOL. BUT! it does help with learning them. you get a sense of all the common kanji like 愛/恋/君/僕 (all kanji i haven't properly learned in class yet!) take my example, 二十歳の戦争 = Hatachi no Sensou = 20 Year Old War