Dear Ella History of Swing Music private show. Book your own History of Music series with Dear Ella. Leaning on years of making and studying music these women bring lots of experience to this style, performing and educating about it. Mary Witt & Ann Percival have sung and played Swing Music together for 30 years and Annie has done the same, sometimes with The O-Tones, and sometimes with her swing band from Philadelphia, Girls from Mars. You’ll enjoy this look into their personal and professional histories!