THIS year, in celebration of the 250th anniversary of Mozart's birth, his music is being played pretty much around the world non-stop. Yet there are still a lot of his pieces that hardly ever get performed, even in a jubilee year. Some of the best of them will be heard this coming Bank Holiday weekend at Westonbirt School in Gloucestershire, when Bampton Classical Opera presents 'The Jewel Box', a two-act opera made of bits and pieces of Mozart put together by Manorbier resident, Paul Griffiths. "Mozart wrote a lot of operatic music that didn't get into his finished operas," explained Paul. "There are a couple of operas he started and then abandoned. Also, singers would come to him and ask him to write them arias they could use in operas they were appearing in, to replace the original music. So I just took all these various pieces and made them into an opera where the music is entirely by Mozart." 'The Jewel Box' begins with music for one of the operas Mozart didn't complete: 'The Deluded Husband.' He wrote an overture for this, and an opening quartet, where a mature gentleman is preparing to marry a young woman, much to the amusement of his cynical friend. When this music stops, the four characters have to find a way to go on. They call on the composer, who immediately falls in love with the leading lady. Another woman enters - an old flame. And the composer's father arrives, to try to call him out of this operatic mess. Eventually, after two suicides, both of which turn out to be only temporary, a resolution is achieved, and the four characters from the start find their destiny in another Mozart opera, 'The Magic Flute'. Inside 'The Jewel Box', Paul says, are 'fiery songs of rage and indignation, powerful soliloquies of despair, comic moments, and helter-skelter ensembles where several characters are going in different directions.' With an all-star cast, the London Mozart Players and a wonderful stage production by Jeremy Gray, this will be a delightful evening. Performances start at 5 pm, and you can bring a picnic for the interval. For tickets, ring the box office on 01367 860574. And if you can't make it to Westonbirt, there's a repeat performance in London, at St. John's Smith Square, on September 21. The couple who founded Bampton Classical Opera (Gilly French and Jeremy Gray) will be on the Radio 3 program 'In Tune' on Monday, August 21, at the estimated time of 6.15 pm.