¿Hay cantautoras?

 It seems that the entire singer-songwriter tradition in Spain skews heavily toward males. It is not surprising, since many things skews male. Entire genres like rock music, as well as many subgenres of rock. I don't mean that there are no women in these genres, but that there is a heavily male gender marking. 

I don't know enough about Latin American singers of this genre to reach a conclusion. I would guess it skews male here, too, with Violeta Parra as the exception. Folk music had more women involved than hard rock. 

The poets sung by these singers are also male, aside from an odd poem by Gloria Fuertes or an album dedicated to Rosalía de Castro. 

(In classical music, you would tend to find women singers more often singing Lorca Lieder, including his popular songs that he first recorded with Encarnación.)  

It seems to me that we have to recognize these patterns when they are so strongly marked. Classic rock is also strongly white. The reason is that there was the industry was itself segregated, so that black artists were classified as R&B and white artists were rock, with a few notable exceptions. In jazz, the cool musicians were white, and the hard boppers black, although arguably the most fruitful music of this period was Miles Davis's collaborations with Gil Evans (with Lee Konitz) and Bill Evans. 

Women in jazz were mostly singers and pianists, too.  White composers of the classical American songbook were mostly Jewish, taking away Cole Porter and Hoagy Carmichael.  

I guess the lesson is that society is segregated, and gender roles strongly differentiated, it would be unusual to find random distributions in cultural expressions.