In 1975, he and his wife Maureen were seriously injured in a car crash in Rhodes, Greece. This significantly affected the production of Led Zeppelin's seventh album Presence for a few months while he recovered, and forced the band to cancel the remaining tour dates for the year.
In 1977 his oldest son Karac died of a stomach infection when Plant was engaged on Led Zeppelin's concert tour of the United States. Karac's death later inspired him to write the song "All My Love" in tribute, featured on Led Zeppelin's final studio LP, 1979's In Through the Out Door.
These events had a major effect on Plant, and represent a turning point in Led Zeppelin's music, as In Through The Out Door featured a lighter and more progressive sound under the direction of John Paul Jones, with fewer of the hard-rocking numbers the band had been known for. Plant has told an interviewer "I had a couple of bad knocks which, no matter what happens, will always have taken their toll on me. I know that my kind of vision, or the carefree element I had, disappeared instantly when I had my automobile accident in 1975. That kind of ramshackled 'I'll take the world now' attitude was completely gone."[6]



