Last week, a young pianist was working on a piece by J.S. Bach. I mentioned that his family was full of musicians, his father was one and so were many of his children. She made the point that it was his sons, since women weren't allowed to have jobs, they "just cooked and cleaned." While this is partially true, I told her that women have been well respected as excellent composers and performers as long as we have been making music.
So, in honor of that student, here is part of a list of women in music from Oxford Music. I'm listing a few from those that lived around the time of Bach, but go see the list for important women in music from the year 810 to 2000.
1736 - Julie Pinel publishes a collection of French airs.
1740 - Wilhelmina, Princess of Prussia sees her opera Argenore performed at the court opera in Bayreuth.
1740 - Elisabeth de Haulteterre publishes her Primier livre de sonates for violin and continuo.
There are many more at the link. Timelines in music history: Women in music in Oxford Music Online.