After studying at the University of Music in Vienna, Trabesinger was choirmaster for the Vienna Boys' Choir in the 1970s. In 1980, he accepted a professorship for solo singing at the Anton Bruckner Conservatory in Linz. From 1992 to 1994, he was artistic director of the Mozart Boys' Choir and in 1994 he founded the Schubert Boys' Choir and the vocal ensemble Danubia Wien. Since 1982, he has been teaching at the University of Music in Vienna and also works as a voice coach for the Vienna Boys' Choir.
With Trabesinger, the Chorus Viennensis became acquainted with the sound of a male choir based on Carinthian song, and under his direction, the choir gave its first concert as an independent ensemble in Waldhausen in 1976.
