GUEST.PMB wrote:

"Blackbird (I), The (Jacobite) ------ 1651"

Did the Cavaliers have Nostradamus working for them?

If you looked at the entry for the song in the Ballad Index, you'd find the note (in part), "The first broadside versions of this song date to 1650, obviously referring to British King Charles II, who was then in exile following the execution of his father Charles I in 1649. It wasn't safe to refer to him by name, so the allegorical 'blackbird' was used. It seems also to have been used of James II, and perhaps also to his son James III. However, the title came to be most strongly associated with Bonnie Prince Charlie."

So, while it's true that the song in its original form would not have been called "Jacobite," it was pro-Stuart, and it continues to be used once the actual Jacobites came along. As a traditional song, it was associated with Jacobitism.

I called it the "Jacobite" song "The Blackbird" to distinguish it from at least six other blackbird songs, versions of (e.g.) Logan's Lament, Granua's Lament, Cupid's Trepan, I Am a Young Maiden, a parody of "Bye, Bye, Blackbird," and so forth.