It sounded like heavy metal fans
Spinning records backwards of
Nas is referring to backmasking, a process in which a record is played backwards and a sound or message is audible, as if it was played forward. Backmasking was first popularized by The Beatles on the album Revolver (Also, see: Paul is dead)
At around the the 1980’s, when metal was first becoming popular, a heavy metal band might backmask a satanic message onto a track. This became controversial matter. Ever since, backmasking is still used by some musicians.
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