Once every decade or so, a great actor gives a performance that reminds us why we go to the theater. Last year, that actor was Glenda Jackson in Three Tall Women. Now, she’s back on Broadway, climbing the tallest mountain any actor can climb. Glenda Jackson is King Lear. The Tony and two-time Academy Award winner plays Lear for 19 weeks only in an all new production directed by Sam Gold, featuring an original score by Philip Glass.