His ad-campaign clients range from Marshall Field to Lands' End to the chamber-music series at the University of Chicago.

Meanwhile, at Dowling College's Fortunoff Hall in Oakdale, the avant-garde takes over the Islip Arts Council's free chamber-music series.

After years of bobbing gently in the East River, Bargemusic, the floating chamber-music series, retains the touch of eccentric novelty that drew music lovers' attention when Olga Bloom started it in 1977.

And this year the French Institute/ Alliance Francaise started a chamber-music series at its four-year-old Florence Gould Hall.

For instance, I took the chamber-music series and made it chamber music of the world.

And there will be public events, even before the acquisition of the theater, starting with a salonlike chamber-music series in one of the center's studios.

On Tuesday and Wednesday nights last week, the quartet presented it as part of the 92d Street Y's chamber-music series.

This chamber-music series in the Berkshires was founded by Elizabeth Sprague Coolidge in 1918 and is presented in a 440-seat hall that she built for the purpose.

Tonight at the festival's chamber-music series at Princeton University, there will be the String Quartet No. 3, which won the New York Music Critics Award in 1947.

Besides tonight's gala, there is the opening, on Tuesday, of a chamber-music series with a new work by a woman composer on each program.