For 10 points, name this instrument which is the subject of a verse known as the national epic of Albania.
A play titled after this instrument revolves around the literary genius Cai Boxie, who's compelled to marry the Prime Minister's daughter Lady Niu after he passes the imperial exams. That play is the major work of the 14th century playwright Gao Ming. Another one of these instruments will not play until seven sons of its owner are killed in battle, and the blood of those sons enter the instrument - but that one finally plays the Dausi song, which is said to grant its owner immortality, after the fall of the kingdom of (*) Wagadu. One of these instruments provides the title of the best-known work by Father Gjergj Fishta. In the aforementioned story first collected by Leo Frobenius, this instrument is owned by Gassire, who longs to be king of Ghana. For 10 points, name this instrument which is the subject of a verse known as the national epic of Albania.
A play titled after this instrument revolves around the literary genius Cai Boxie, who's compelled to marry the Prime Minister's daughter Lady Niu after he passes the imperial exams.
lute [accept the works in question: Lute Song, Gassire\'s Lute, and The Highland Lute]