Wind ensembles (also known as 'concert bands', 'symphonic bands', 'wind orchestras', etc) are performing groups consisting mainly of woodwinds and/or brass instruments. Commonly associated with communal institutions -or the military- concert bands perform repertoires including original music, transcriptions of popular tunes, and light pieces. Marching bands feature a similar instrumentation, though they differ in that their purpose is to play music while marching, instead of functioning as a concert ensemble.