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To March 18

If you’re a Stephen Sondheim nut, you already have tickets to the KenCen’s six-musical Sondheim Fest, the extra concerts, and the “live” Frank Rich interview with the master. You can probably sing along with the albums, and you may even profess to know Sondheim’s theories on the art of making art. But if you’ve missed the terrific first three talks in Mark Horowitz’s “Six by Sondheim” companion lecture series, you’ve already squandered the chance to hear the world premiere of a song cut from Company. You’ve missed the Cameron Macintosh Birthday Bash video in which Sondheim (pictured) and Andrew Lloyd Webber perform “Send in the Clowns” with altered lyrics (“Isn’t he rich…”). And you’ve passed on the excerpts from the six-and-a-half hours of videotaped interviews Sondheim granted Horowitz, in which the composer not only talks about a patter number he never got around to writing for three startled vice presidents in Assassins but also tells an anecdote in which he does a deliciously bad Kate Hepburn imitation. Horowitz is the Library of Congress’ expert on Sondheimiana—the man’s a witty treasure trove of factoids and entertaining theories about the compositional methods of Broadway’s most accomplished composer/lyricist. His remaining lectures start at 6:45 p.m. Mondays, to Monday, March 18, at the Library of Congress’ Coolidge Auditorium, Jefferson Building, 101 Independence Ave. SE. $23. For reservations call (202) 357-3030.