When you step into Antiques & Tools of Business & Kitchen , at 65 Westchester Avenue in Scotts Corners, Pound Ridge, N.Y., you'll be wooed by the Baroque music on WNYC Radio, or the American classics of Jonathan Schwartz on a Sunday afternoon. Take a look around and you'll find stuff you may have long gotten rid of but wished you had saved like campaign buttons for Ike, JFK, Bill and Hillary, sheet music from the '20s, bartending trinkets and shelves of other vintage antiquity from the work place to the kitchen. Welcome to the world of Joan Silbersher, proprietor, who has a keen eye for the kitsch. On Sunday, April 27, from noon to 3 p.m. , she will celebrate her 24th anniversary in Scotts Corners with a barbecue lunch to benefit the Pound Ridge Library , along with a free raffle and five gift certificates for $30. "I'd go crazy without this shop," said Joan from her desk that has a perfect vantage point of the four corners on Westchester Avenu...