Music at 54:00

Can someone identify for me the song that's heard starting a little before 54 minutes into the documentary? It's just beautiful vocalizing, no words, but I can't place it.

There are disappointments about this documentary, including the absence of Marilyn Wilson, who's remained one of Brian's biggest champions throughout the years, and others close to him, but it's all made up for by the reactions of Don Was and the comments from Bruce Springsteen, Elton John, and some others. The Beach Boys' music was basically the only thing that made my life worthwhile during my teenage years, period, so I'm more than a fan. And I've seen every film and doc and read every book about them, so I probably should be more critical, but I find that there are some thrilling moments in this film that make it absolutely worthwhile.