Passage: Madonna's music has been the subject of much analysis and scrutiny. Robert M. Grant, author of Contemporary Strategy Analysis (2005), commented that what has brought Madonna success is "certainly not outstanding natural talent. As a vocalist, musician, dancer, songwriter, or actress, Madonna's talents seem modest." He asserts Madonna's success is in relying on the talents of others, and that her personal relationships have served as cornerstones to the numerous reinventions in the longevity of her career. The author believed that Madonna's approach was far from the music industry wisdom of "Find a winning formula and stick to it". Her musical career has been a continuous experimentation with new musical ideas and new images and a constant quest for new heights of fame and acclaim. Grant concluded that "having established herself as the queen of popular music, Madonna did not stop there, but continued re-inventing." According to Thomas Harrison in the book Pop Goes the Decade: The Eighties, Madonna was "an artist who pushed the boundaries" of what a female singer could do, both visually and lyrically.Throughout her career Madonna has been involved in writing and producing most of her own music. Stuart Price, one of her past collaborators, said that "You don't produce Madonna, you collaborate with her. She's a really good producer herself and obviously a great writer too. She has her vision and knows how to get it." Madonna's early songwriting skill was developed during her time with the Breakfast Club in 1979. According to Carol Gnojewski, her first attempts at songwriting are perceived as an important "self-revelation". Madonna later became the sole writer of five songs on her debut album, including "Lucky Star" which she composed on synthesizer. As a songwriter, she has registered a total of 287 songs to ASCAP, including 18 songs written entirely by herself. Rolling Stone has named her "an exemplary songwriter with a gift for hooks and indelible lyrics." According to Freya Jarman-Ivens, Madonna's talent for...

Question: Who claimed the Madonna's talent was not outstanding?
Robert M. Grant