So concludes SUNDAY IN THE PARK WITH GEORGE, a musical that many consider to be Stephen Sondheim’s masterpiece. For the record, that musical’s closing number, “Sunday,” does make it into SONDHEIM’S OLD FRIENDS, the latest Broadway-bound revue of the composer’s music in its U.S. premiere at the Ahmanson Theatre. In fact, it’s the only song from SUNDAY that makes the cut. Some of the Sondheim faithful will invariably take issue with what’s in and what’s out of this Cameron Mackintosh-produced “great big Broadway show” that is OLD FRIENDS. Overheard on opening night during intermission was an attendee expressing his disgruntlement over the total omission of any songs from ASSASSINS. Yeah, tough choices need to be made when you’re dealing with a musical catalog this vast.