According to a story in the Nashville Scene, women make up less than 5% of the engineers and producers in the music industry:
"Women are as visible as ever in music — between them, Taylor Swift, Beyoncé and Lady Gaga have sold over 22 million records since 2008. But look closer at the credits on those albums, and women's names are few and far between. What about producing and engineering? Who's guiding the sound and leading the recording process, and doing the work in the studio that takes the sound waves, electrical impulses and digitized bits of sonic information and shapes them into the music we hear? Those roles are almost all filled by men. Beyoncé was a producer on I Am ... Sasha Fierce, but she is a rare specimen. By most estimates, women represent less than 5 percent of producers and engineers industry-wide."
(Via tinyluckygenius aka the Unicorn's tear)