Pianist Menahem Pressler has been teaching and performing for over half a century now, so it’s fair to say that he has some small wealth of knowledge and experience to pass on to the next generation of keyboard enthusiasts. Since winning first prize in the 1946 Debussy Piano Competition and founding the Beaux Arts Trio at Tanglewood in 1955, he has enjoyed an active performance schedule both as a soloist and as a member of the esteemed ensemble, which is also the first trio-in-residence at the Library of Congress. This afternoon, Pressler coaches future virtuosos from the Levine School of Music in a master class open to the public. At 2:30 p.m. at the Library of Congress Coolidge Auditorium, Jefferson Building, 1st & Independence Ave. SE. Free. (202) 707-8432. (Amy Domingues)