These two recordings, contributed to the Female Bird Song Project and online at the Macaulay Library, are the first documentation of song by two separate female Cerulean Warblers! The article describing these novel vocalizations just came out in the Wilson Journal of Ornithology! Thank you, Garrett MacDonald, for your contribution and congratulations on the publication!

https://bioone.org/journals/The-Wilson-Journal-of-Ornithology/volume-131/issue-2/18-104/Novel-vocalizations-including-song-from-2-female-Cerulean-Warblers-Setophaga/10.1676/18-104.full