SM-Trax is an electronic duo from Germany consisting of producers Stefan Grunwald and Mirko von Schlieffen. In mid-1999 they went to number one on the US Hot Dance Music/Club Play chart with "Got the Groove", released on Groovilicious Records. SM-Trax eventually went on to produce "... Is Calling" (also known as "SM-Trax Is Calling"), with lyrics discussing the nature of house music, while the chorus features a repeated "Wake up, SM Trax is in the club" line. "... Is Calling"... [more on Wikipedia]