By MARK KENNEDY, AP Entertainment Writer NEW YORK (AP) — In 2010, the year he turned 80, Stephen Sondheim had to endure a public fuss when a Broadway theater was being renamed in his honor. At a ceremony outside the 1,055-seat auditorium on West 43rd Street, the composer looked sheepish by the time he got to the podium following gushing words from admirers that included Patti LuPone and Nathan Lane. He also offered up a window into his psyche. “I’m thrilled, but deeply embarrassed,” he said, tearing up as a mid-September sun fell over the Stephen Sondheim Theatre. “I’ve always hated my last name. It just doesn’t sing.” The comment…