Flemming Rasmussen (born 1 January 1958 in Copenhagen) is a Danish engineer, producer, mixer and owner and founder of Sweet Silence Studios in Copenhagen, Denmark. Rasmussen is currently main engineer/producer at Sweet Silence North in Helsingør.
Throughout his career, Rasmussen has worked with many different music genres, but is best known for his work with heavy metal.
Rasmussen began his career as an assistant at the Rosenberg Studios facility run by producer/engineer Freddy Hansson. In 1976, Hansson founded the Sweet Silence Studios and brought Rasmussen with him. In 1980, Rasmussen became co-owner of the studio, and one year later became an engineer, recording the 1981 album Difficult to Cure by Rainbow. His work there attracted Metallica, who brought Rasmussen to work on their album Ride the Lightning (1984). The partnership continued through Master of Puppets (1986) and ...And Justice for All (1988).
He also produced the Morbid Angel album Covenant,Blind Guardian's albums Imaginations from the Other Side,The Forgotten Tales and Nightfall in Middle-Earth,Artillery's By Inheritance and Ensiferum's Iron, amongst others. In 1999 he took over Sweet Silence, which was demolished in 2009 to make way for an apartment complex and a car park. Rasmussen then moved to Winding Road Studios in Copenhagen. He then left in January 2014 to reopen Sweet Silence in Helsingør north of Copenhagen, under the name of Sweet Silence North.