Mayfield's music is pretty unique. The influence of her early experience with bluegrass and country can be heard in her voice. However, her lyrics tend to be dark. She sites Foo Fighters as one of her influences, and recently contributed to a Nirvana tribute album.
Here's Jessica Lea Mayfield performing "For Today" live in studio and KEXP in Seattle.
More about Jessica Lea Mayfield can be found at her website.