On a recent Tuesday evening, the seats at Symphony Hall are empty but the stage is full from one end to the next. Rows of college-age singers fan out amid numerous string and horn players and other musicians. Conductor Keith Lockhart is at the podium, singer-songwriter Sarah Walk is at the piano, and six cameras rove slowly, including one on a crane, capturing the whole performance for an upcoming video.
It’s a grand moment for a series that started with such humble intentions. This particular Symphony Hall performance is a collaboration between “The Loft Sessions,” a video showcase for Berklee College of Music students and alumni, and members of the Boston Pops.