Most operas begin with an overture, an orchestral introduction that includes many of the musical themes of the piece.
Answer:
Compound Meter
Explanation:
The six quavers can either be grouped into two beats (compound duple) or three beats (simple triple). Since the simple triple pattern already belongs to 3/4 time, 6/8 is compound duple. Notice that each beat in 6/8 is a dotted quarter note. In fact, all compound meters will have some dotted note as its beat.
