DJ Mastra aka Mastra aka Duo Pad (one half of the Trauma Duo, together with John Trauma), civil name Stefan Willenegger, is a dj/producer based in Berne/Switzerland. Born in 1978 to a Swiss father and an Italian mother, Mastra started to spin records around 1994. Originally trained as a car mechanic, Mastra's main focus in life was always on music, and thanks to a certain event organizer called Nik Leuenberger he got the opportunity to play in front of an audience in a club for the first time.

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