As the site states –
A weekly programme on Soundart Radio 102.5fm http://www.soundartradio.org.uk featuring music by female composers ancient and contemporary, from Hildegard von Bingen to Hildegard Westerkamp. We are open to submissions from women worldwide. Listen live on Thursdays from 2pm GMT.
YES! Women composed great music through time. Little known and published but valuable nevertheless!
A fantastic list of Women Composers and their links, scroll down the page to view.