POPSearch 2005 has a winner. Last night Frances Botelho-Hoeg sang ''When You're Good to Mama" from ''Chicago," brought down the house, and won the opportunity to sing with Keith Lockhart and the Pops on the Fourth of July and on tour.
Botelho-Hoeg, 56, is an elementary school principal from Kingston. She strutted onstage in a hot-mama bugle-beaded lavender number that she said afterward she has never worn to school. Completely at ease with herself and with the public, she knows exactly what her voice can do, and she did it. She played the mildly risque lyrics for laughs, but there was something triumphant in the way she shifted her basically light voice into high gear at the end. And she's a survivor. Last year she entered POPSearch and was eliminated in the second round. ''I got canceled at Copley Square," she said good-naturedly at intermission.