All that can presently (June 2022) be gleaned about Josephine La Barte from sheet music covers and by Internet searching is that she was presumably an English music hall singer who has been featured on 2 works published between 1908 and 1909.
Surfers are welcome to contribute any further information about this performer.
Don't Be Ridiculous, Nicholas
George Arthurs (music)
Clarence Wainwright Murphy (words) Josephine La Barte (perf.)
This list is arranged by composer and contains 2 works performed by Josephine La Barte who is featured on sheet music covers.
It does not claim to be complete and represents only the number of items located.