撒姆爾‧巴伯聲樂作品研究 :「在燦爛的夜晚--鄭琪樺演繹巴伯歌樂」獨唱會詮釋報告 = A study of vocal works by Samuel Barber with the repertoire of the recital "Sure on this shinning night : Chi-hua Cheng interprets Barber's songs"