What instruments are in a fanfare?
Normally, a fanfare is a triumphal or heroic type of entrance music used to announce the arrival of a potentate or clergy or noble of some sort. Rather repetitious in form, the instruments used are easily portable and mostly of the horn category. Heroic movies uniformly show a row of trumpeters with long bells on the horns, and with heraldic symbols on small banners attached. State entrances in the Roman era often had stringed instruments and drums and cymbal type melodic noise makers and these have been seen on ancient jars found at the Getty Villa in the Roman collection. If you were a potentate, you made sure you let the common people know you were arriving.
A fanfare is usually a short passage of some type of announcement tune that is played on one or more brass instruments. They are usually played when introducing an important character or characters into a scene, such as a King or Warrior. They are usually royal and majestic-sounding with many perfect fifths, octaves, and fourths (open tones sound more fanfare-like).