Harmonie Transverse, which means flute wind band, is celebrating its thirteenth season. It was formed by flutists who performed with the New England Conservatory’s Metropolitan Flute Orchestra. These include the piccolo, C Flute, G Alto Flute, Bass Flute and Contra Bass Flute, which provide a six octave range nearly covering the full range of a piano and an orchestra. Harmonie Transverse is under the umbrella of the Wachusett Regional High School’s Artist in Residence program: TEMPO (To Encourage Musical Performance Opportunities).