I've just finished reading the 'Led Zeppelin - Ultimate Music Guide' which has some great interviews. I'm intrigued by a comment Robert makes in a 1977 Interview (from Melody Maker 25/6/77 interview, on page 92). He says 'I play guitar on four tracks on our albums but I wouldn't dare play onstage'.
I'm intrigued to know what the four songs are? I think 'Going to California' is one of them, Does anybody know what the four songs are?