These four stellar dance-friendly one-hit wonders have some of the very best hooks in the history of pop music.

Taylor Swift brought out Gracie Abrams to perform their now Grammy-nominated collaboration "Us" Saturday at the Eras Tour concert in Toronto.

Taylor Swift brought out her opening act Gracie Abrams to perform their Grammy-nominated song "Us" at her most recent Eras Tour stop in Toronto.

Tori Amos' 'Professional Widow' has long been rumoured to be about Courtney Love - but she says they've never met. Read more about it here.

Oh hi, Gracie Abrams! The 25-year-old songbird joined Taylor Swift on her third night in Toronto for Saturday's acoustic set.