Rasmus Gardell, known professionally as Rasmus (a.k.a. Rasmushroom) is a Swedish electronica and breakbeat music producer. Its best known released albums are Mass Hysteria (1998) and the album Serious Pranks (2000), two breakbeat records that were released on Bolshi Records. Rasmus has also had various singles including Punk Shock (1998) released under the same label.