…
Here’s information about the group’s songs.
Look at this article that I read recently. It explains some of it.
Robert Plant/Jimmy Page.
This site also lists the work of LZ, and most of the songs are attributed to Page/Plant.
By my count, based on the source linked by @filmfann, Page wrote or collaborated on 80 of their tunes, and Plant on 75 of them.
Agnes Moorehead.
Probably should have worded it, which band member.