Need
Difficulties arise whenever a composer writes a piece for orchestra in which he calls for reproducing the effect of church bells. Well-known examples include 1812 Overture, The Golden Legend, Cavalleria Rusticana, Pagliacci, Rienzi, and Parsifal. The most serious difficulty of all arose in Parsifal, where the bells are called for in an extremely solemn scene with deep religious significance. If real church bells were used for the notes Wagner wrote, they would overpower the orchestra and ruin the solemn atmosphere on the stage.
Read more about this topic: Parsifal Bell