Classical Music for 200, Alex

I read in the Globe and Mail Facts and Arguments that a researcher has determined that at least five of Bach's pieces were actually written by his wife.

I wonder how many talented women used their husband's names to publish their artistry. I couldn't think of any female classical composers, and it has to be solely due to sexism.

I've heard rumours of Shakespeare being a multitude of people and not just one (he didn't even sign his name consistently). I wonder if perhaps there was a group of women who did the writing (even if they did borrow heavily from Marlowe).