There are interviews of varying degrees of illumination by Taylor (who speaks uninsightfully about his music and frankly of his drug addiction and recovery), King (who seems like one of the nicest people imaginable), Jackson Browne, David Crosby, Steve Martin (who played serious banjo in addition to working out his comedy act during that era), the excellent author Barney Hoskyns, and the great rock photographer Henry Diltz. There are some interesting comments from the small circle of musicians who backed a lot of these artists in the recording studio, including guitarist Danny Kortchmar.Of course James Taylor would be uninsightful, he's not insightful in his songs either. And for a singer-songwriter, you quickly notice his 'hits' are written by other people. When that happens with a woman, she tends to get derided. But the very nasl, very upper class Jamie got away with all those bad White bread takes on songs like "Up On The Roof," "Handyman," etc. Around the time JT thought he could cover Sam Cooke was probably when I realized that JT had done such damage to himself via drugs that he would never recover.
Joni Mitchell's an artist. She's covered in the film but she should be the focus. There's no mention of Carly Simon or Laura Nyro but they should be there as well. If they left Laura out (I'm sure they did), they probably made an all White special. (While Laura is White, her music was soulful and her influences were as well.) So that would mean no Ashford & Simpson despite the fact that the time period the film covers is when Nick and Valerie start hitting their artistic stride.
Closing with C.I.'s "Iraq snapshot:"