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Cao độ (âm nhạc) Đọc thêm|coauthors=
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Cao Cao Bằng Cao Lãnh (thành phố) Cao Câu Ly Cao Ly Cao khảo Cao Lãnh (huyện) Cao Biền Cao Bá Quát Cao Minh ĐạtTài liệu tham khảo
WikiPedia: Cao độ (âm nhạc) http://www.aruffo.com/eartraining/research/article... http://books.google.com/books?id=3N72rIoTHiEC http://books.google.com/books?id=6_iy8tixc_oC&pg=P... http://books.google.com/books?id=AF30yR41GIAC&pg=P... http://books.google.com/books?id=I5k0jC0MbXcC&pg=P... http://books.google.com/books?id=RUDTFBbb7jAC http://books.google.com/books?id=Slg10ekZBkAC&pg=P... http://books.google.com/books?id=ZYXd3CF1_vkC&pg=P... http://books.google.com/books?id=l-ndNsXrB1IC&pg=P... http://books.google.com/books?id=n6VdlK3AQykC&pg=P...