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I am very skeptical of the claim made in the second story, that there is a piece of music called "Butterfly Jig" which can be documented to be a thousand years old. A Jig is a dance form, and I know of no western European dance music that survives and can be deciphered from the 10th or 11th centuries. So far as I know, all the music surviving from before the year 1000 is vocal church music. From the 11th-12th centuries we have "Kalenda Maya", which is derived from a dance-tune, but the form in which it survives is a song.
T.