I Will Always Love You was written by Dolly Parton. It and Un-Break My Heart by Diane Warren I think are the only two songs written by women to have sold over 10 million copies (out of about 50 songs that have; must be the patriarchy). e: Mariah Carey is a co-writer on All I Want for Christmas Is You but it sounds like her cowriter did much of the heavy lifting.

I Will Always Love You was written by Dolly Parton. It and Un-Break My Heart by Diane Warren I think are the only two songs written by women to have sold over 10 million copies (out of about 50 songs that have; must be the patriarchy).