This spring, 65 Homewood-Flossmoor High School singers will take their musical talents to northern Italy led by teacher and choir director Michael Rugen. During the nine-day trip, students performing as the H-F Master Singers will sing at a mass in Venice; at the Duomo, the main cathedral in Milan; and a number of impromptu performances along the way. Rugen said in all the singers will perform five or six times in the nine days. The trip includes stops in Milan, Florence, Pisa, Siena, San Gimignano, Venice and Verona. Rugen said his first trip as director . . .