Trailer for the Linda Ronstadt documentary 'The Sound of My Voice'

The CNN Films documentary will explore the life and career of retired and underrated singer Linda Ronstadt. The film also goes into her activism and Mexican heritage and up to her eventual disappearance from the spotlight after being diagnosed with Parkinson's disease.

Among those interviewed are Dolly Parton and Emmylou Harris. The film hits theaters this September.

Source, YouTube