From England, where trends start: a pop music movement based on turning down the amplified volume at concerts. Rock performers Ian Trimmer and Billy Jenkins, whose instruments are saxophone and, of course, guitar, are touring England spreading their gospel of less is more: "A little pianissimo/Wouldn't go too much amiss-imo/Too much fortissimo/ makes your ears hiss-imo." Their sentiments are supported by Ginger Baker, who played drums in the legendary trio Cream: "I find that loud noise harts my ears now." He also suffers from loss of sleep and ringing in the ears after performances . . .

Lovers of opera who are lovers of royalty will have a treat when they watch Britain's royal wedding this July. Kiri Te Kanawa, the noted New Zealand soprano, will join trumpeter John Wallace in a performance of Handel's "Let the Bright Seraphim," at the ceremony in St. Paul's Cathedral . . .

More stars on the boards this summer: Sigourney Weaver essaying Rosalind in "As You Like It" at the Dallas Shakespeare Festival. David Ogden Stiers stretches a bit from his role in M*A*S*H to play King Lear at the Old Globe in San Diego. Michael Tolaydo, who directed the Folger's current production of "Romeo and Juliet," will be in Sante Fe to star in "Terra Nova." ("Terra Nova," by Ted Tally, is the best-kept secret in the American theater, garnering high praise from critics in the few regional theaters where it has been performed. The Kennedy Center has been mentioning the play as a possible Eisenhower Theater production for two seasons) . . .

Margaret Whitton, currently playing Juliet at the Folger, is leaving the production to play Lady Percy in "Henry IV, Part 1" at Joseph Papp's New York Shakespeare Festival in Central Park. She will be replaced by Cecilia Hart beginning June 29.