American rock music legend Lou Reed, cofounder of The Velvet Underground band, died over the weekend, his agent, Andrew Wylie, said. He was 71.

The causes of Reed's death have not been revealed, though Wylie said they could be related to a liver transplant he had last May.

The musician died in Long Island, New York, on Sunday.

As leader of The Velvet Underground, which he created together with Welshman John Cale in 1964, Reed renewed the language of rock and roll with numbers known for an unusual mix of noise and melody.

His songs tell the story of bohemian life in New York in the 1960s and 1970s, with lyrics both graceful and rough.

His 1967 debut album, "The Velvet Underground & Nico," with a cover by artist Andy Warhol, has become a gold standard of pop music.

Later and on his own, he recorded such works such as "Transformer" (1972), "Berlin" (1973), "Metal Machine Music" (1975) and "New York" (1989) which also won critics' applause.

The composer of such classics as "Sweet Jane," "A Perfect Day," "Walk on the Wild Side" and "Heroin" was married to musician and experimental performance artist Laurie Anderson. They lived in New York.

A lover of meditation, Reed published in 2007 a disc of ambient music entitled "Hudson River Wind Meditations."

His last work was "Lulu" in 2011, a collaboration with the heavy metal band Metallica. EFE