All that can presently (September 2022) be gleaned about
Myrtle H. Bard from sheet music covers and by Internet searching is that she was presumably an American actress/singer who has been featured on 2 works published in 1913.
Her portrait on the left is taken from
Floating Down the River (1913) music by
James White, words by Roger Lewis and published by
Will Rossiter, Chicago, Illinois, USA. She is shown together with
Mae Curtis who also featured that song.
Surfers are welcome to contribute any further information about this performer.