who will be taking part in a special fund-raising concert in aid of the National Gallery this weekend. Directed by Marjorie Pettit (right), and entitled Four Centuries of Song, the programme will embrace music from Mozart to Cole Porter. A special, eight-part chamber choir will be supported by some of Bermuda's best classical musicians, including tenor soloist Brian Semos, Margaret Fox and William Duncan at the piano, Lisa Wyatt on clarinet, Jonathan Palmer, double bass and percussionist Glynn Quarterley. The concerts will be on Friday, March 18 and Saturday, March 19 and include a champagne reception in the gallery. Tickets are $40. Telephone 295-9428 for reservations.