yán / jiū / sòng / cí / de / rén / cháng / cháng / chá / yuè / cí / pǔ / yǐ / liǎo / jiě / měi / zhǒng / cí / pái / de / gé / lǜ研究宋词的人常常查阅词谱,以了解每种词牌的格律。People who study Song-dynasty lyrics often consult lyric pattern books to learn the rules of each tune pattern.