The January 23 session featured additional instrumental tracking, including a 16-piece string and horn section overdubbed onto the bounced tape of the backing track from December 15. In 2011, Linett commented, "It’s interesting because there’s a session sheet indicating that the second half of 'Surf’s Up' – the backing track was recorded. But there's never been any taped evidence of it, and obviously there was no taped evidence when the Beach Boys went to finish it in the Seventies. And nobody, including Brian, can confirm that it ever happened. So it may have been a session that was mislabeled, or a session that got canceled."