Linda McCartney was a good rock photographer--this should not be forgotten.
Her book "Linda McCartney's Sixties" documents her abilities as well as the access she had to many critical 60s performers. Being an attractive woman with a camera was a bit of an anomaly back then, and Linda took full advantage of this.
Approaching musicians with a combination of wide-eyed interest and complete understanding of the games involved in the business, she combined an artistic sense with insight into the characters of the scene. Her photos of Traffic are some of the best ever taken of the group; one can also say the same for her photos of the Beatles, Rolling Stones, and Janis Joplin.
The text doesn't always tell as much as the reader would want to know. Linda McCartney was a fascinating figure who saw an awful lot of history, but doesn't always place herself fully in the stories she relates. This is too bad; it appears that her personality was a big part of the value and success of her work.