In collaboration with Michel Evje, Gus produced innovative recordings of Handel's Messiah, which facilitated the study of the choral parts. One stereo channel was a recording of a single voice and the ther channel contained the ensemble. By adjusting the stereo balance a student singers could practice their parts.<ref name="IEEE ITSN"/> | In collaboration with Michel Evje, Gus produced innovative recordings of Handel's Messiah, which facilitated the study of the choral parts. One stereo channel was a recording of a single voice and the ther channel contained the ensemble. By adjusting the stereo balance a student singers could practice their parts.<ref name="IEEE ITSN"/> |