[Published in part (lines 7-24) by Medwin (under the title, "An Ariette for Music. To a Lady singing to her Accompaniment on the Guitar"), "The Athenaeum", November 17, 1832; reprinted by Mrs. Shelley, "Poetical Works", 1839, 1st edition. Republished in full (under the title, To —.), "Poetical Works", 1839, 2nd edition. The Trelawny manuscript is headed "To Jane". Mr. C.W. Frederickson of Brooklyn possesses a transcript in an unknown hand.]
1.
The keen stars were twinkling,
And the fair moon was rising among them,
Dear Jane!
The guitar was tinkling,
But the notes were not sweet till you sung them
Again.
2.
The guitar is fortuitously an instrument that modern young readers relate to. There is something erotic in the way a guitar is held close to the body and the player wraps their arms around it, which may have appealed to Shelley. 

To Jane: The Keen Stars Were Twinkling