The opportunity to hear two great pros, the divinely voiced Karita Mattila in partnership with master accompanist Martin Katz, is irresistible. Whether or not Mattila’s program — Poulenc’s five Banalités, Debussy’s Cinq Poèmes de Baudelaire, Aulus Sallinen’s Four Dream Songs, and five songs by Joseph Marx — capitalizes on her astounding theatrical acumen, it’s sure to bring out her gift for the sensuous.