Listen to The Belles of St Trinian's. Exploits for Orchestra: I. Prelude. Allegro online. The Belles of St Trinian's. Exploits for Orchestra: I. Prelude. Allegro is an English language song and is sung by Rumon Gamba and BBC Philharmonic Orchestra. The Belles of St Trinian's. Exploits for Orchestra: I. Prelude. Allegro, from the album The Film Music of Sir Malcolm Arnold, Vol. 2, was released in the year 2000. The duration of the song is 1:28. Download English songs online from JioSaavn.