胸きょう声せいきょうせいMeanings1nounchest voiceTechnical term in vocal music and speech science, referring to the lower, fuller vocal register. Often contrasted with 頭声 (とうせい, head voice).See also: 頭声歌か手しゅは胸きょう声せいと頭とう声せいを使つかい分わけて歌うたう。The singer uses both chest voice and head voice when singing.