The article's headline indicates that Dolly Parton once described a fellow singer from the 1960s as her "musical sister," but the source page provided contains only site navigation and menu elements, with no actual article text available to summarise. As a result, no verified details about which singer Parton was referring to, the context of her remark, or when it was made can be confirmed from this source.

To provide an accurate, neutral summary in British English, the full article text would need to be retrieved, as the current content does not include any substantive reporting beyond the headline itself.