Nattramn (Mikael Nilsson) is a musician Swedish known to have participated as vocalist in the band Black Doom, Silencer . Nattramnar is a character of folklore of Sweden flying over the forests of Småland in the form of bird and souls of children takes not baptize or people who commit suicide. One feature of this character is that it emits a squeaking, similar to the squeal of a rusty wagon wheels sound.