Opus Esoterica was written to be a brief rhapsody on the various lip-slurs and tonguing exercises that trombonists know all too well. Beginning very simply, as if the performers are 'warming-up', the piece develops into a powerful essay of arpeggios and complex rhythms and demands tremendous ensemble precision, coordination and power. Range: Trbn; 1-high Dflat to Trbn. 4 (bass); pedal F.