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By Madeline Halpert
BBC News, New York
Cynthia Weil, the prolific songwriter behind You've Lost That Lovin' Feeling, has died aged 82, US media report.
Her daughter, Jenn Mann, told TMZ that her mother died on Thursday night.
She was "the greatest mother, grandmother and wife our family could ever ask for", Ms Mann said. "She was my best friend, confidant, and my partner in crime and an idol and trailblazer for women in music."
No cause of death for Weil was provided.
A New York native, the Grammy winner was known for a number of songs she wrote, including On Broadway, Make Your Own Kind of Music, Walking in the Rain and Uptown.
She rose to prominence in the 1960s, when she co-wrote many hits with her husband Barry Mann, whom she was married to for 62 years.
The pair met while working at the Brill Building in Manhattan and decided to work together, along with producer Phil Spector. The couple eventually became two of the most popular songwriters during the emergence of rock'n'roll.
Weil and Mann were invited into the Songwriters Hall of Fame in 1987 and the Rock & Roll Hall of Fame in 2010.
The pair worked with some of the most popular artists in the US, including Carole King, Dolly Parton, Neil Diamond and The Monkees.
Born in New York, Weil initially trained as an actress and a dancer before discovering her passion for song writing.