`` Diamonds Are Forever '' author Molly Weasley 's offers details on character J.K. Rowling . The `` Singing Sorceress '' is imagined to resemble Celestina Warbeck , Pottermore.com says . Warbeck is Molly Weasley 's favorite singer . In a note on Pottermore.com ( sign-up required ) , author J.K. Rowling mentions that the `` Singing Sorceress , '' as she is known , has made occasional off-stage appearances in the Potter books and in a `` Daily Prophet '' series done for the Potter fan club . Piece on Warbeck is on Pottermore.com .
`` Diamonds Are Forever '' author Molly Weasley 's offers details on character J.K. Rowling . The `` Singing Sorceress '' is imagined to resemble Celestina Warbeck , Pottermore.com says . Warbeck is Molly Weasley 's favorite singer . Piece on Warbeck is on Pottermore.com .