[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.
As the moon's soft splendour
O'er the faint cold starlight of Heaven
This wasn’t a new experience. Shelley craves the sensation of watching and hearing Jane play, over and over again. 
 The first stanza sets up the rhyming pattern and irregular line length that will continue in the remaining stanzas.
To Jane: The Keen Stars Were Twinkling