Amirbai Karnataki background song forgtten artists

There seem to be more like her sister Goharbai Karnataki (who had an interesting life with Bal Gandharva), Hirabai Barodekar etc. Music seems to be one thing which somewhat unifies the subcontinent.
P.S. See also http://www.youtube.com/watch?v=4eWlfejlJRQ&feature=related from the same people who uploaded the above http://www.filmimpressions.com/