GMS (also known as the Growling Mad Scientists) were a Dutch psychedelic trance duo which has attained significant popularity, beginning in the early 1990s. Formed by Shajahan Matkin (also known as Riktam) and Joseph Quinteros (also known as Bansi) in the city of Amsterdam, located in the west of The Netherlands, the duo has attracted a large international fanbase. GMS founded Spun Records in 1999, the first psychedelic trance label in the United States and Ibiza, Spain.
