Original: Widor 's best-known single piece for the organ is the final movement , Toccata , from his Symphony for Organ No. 5 , which is often played as a recessional at wedding ceremonies and even at the close of the Christmas Midnight Mass at Saint Peter 's Basilica ( The Vatican City , Rome ) .
Simplified: The Toccata from his Symphony no 5 is one of the best known of all organ pieces , often played at the end of wedding ceremonies .