For filling, beat cream cheese, sugar, flour, and extract in a large mixing bowl with an electric mixer until combined. Add egg yolks and the whole egg all at once, beating on low speed just until combined. Stir in half-and-half and chopped white chocolate. Pour filling into crust-lined pan. Place in a shallow baking pan in oven.
Bake in a preheated oven for 35 to 40 minutes or until center appears nearly set when shaken. Cool in pan on a wire rack for 15 minutes. Loosen the crust from sides of pan and cool cheesecake completely. Cover and chill cheesecake in the refrigerator at least 4 hours before serving.
Heat corn syrup, water, and the 1 tablespoon butter until butter melts and mixture just boils. Pour over chocolate pieces in a small bowl; let stand 1 minute. Stir until smooth. Spread over top of cheesecake. Chill 5 to 10 minutes or until chocolate is set. If desired, garnish with whipped cream and Chocolate Lace Musical Symbols.
Chocolate Lace Musical Symbols
Melt semisweet chocolate and shortening. Let cool slightly. Place in a plastic bag. Cut a small hole in one corner and pipe the shapes onto waxed paper. Let garnishes stand in a cool, dry place until firm.