Metallica were reduced to tears during the recording of "Lulu"

Metallica were reduced to tears during the recording of "Lulu" by Lou Reed.

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The New York musician teamed alongside with the Californian heavy metal group for the collaborative album, and guitarist Kirk Hammett recognized that song, "Junior Dad" started crying during the recording.

He said: "I had just lost my father literally three or four weeks previous. I had to run out of the control room, and I found myself standing in the kitchen, sobbing away."

Kirk was joined by lead singer and rhythm guitarist James Hetfield - whose dad left his family where he was 13 - who was in a similar state.

He added: "James came into the kitchen in the same condition - he was sobbing, too. It was insane."

"Lou managed to take out both guitar players in Metallica in one fell swoop, with his amazing poetic lyrics."

The lyrics to the song include the lines: "Say hello to junior dad/The greatest disappointment/Age withered and changed him."

"Lulu" in Berlin, originally for a theater production based on a tune written by the flame - was recorded earlier this year for release on October 31 and November 1 in Europe is based in the United States.