Those lips, those eyes - those lips! And when you're talking about trumpeters, the lips matter most. They serve Alison Balsom well, which is why the 29-year-old blond trumpeter is such a big noise in her native Britain. She makes her New York debut Sunday at 5 p.m., at Free for All at Town Hall, backed by violin, cello and keyboard. Expect to hear new transcriptions of pieces by Bach, Handel and more, played with a liquid-silver tone one reviewer rhapsodized as "sweet nectar." Pick up your free tickets (two per customer) the day of the performance at the box office, 123 W. 43rd St., from noon on; (212) 707-8787.