“Adam Guettel craves control. Journalists arriving for interviews without tape recorders have even known the composer-lyricist to proffer his own digital device. ‘I turn it on and say, “I’m going to e-mail this to you, and this is what you’re going to make your interview based on,” ‘ Guettel explains crisply.” The two Tony Awards he won for “The Light in the Piazza” have given Guettel, the 41-year-old grandson of Richard Rodgers, a measure of control over his career.