Court case argues that former tourmate should be given a writing credit on the song
Zeppelin guitarist raves about Donegan's 'Rock Island Line' in new book
The guitarist claims the frontman made the offer in 1975
Bonham isn't sure such a performance would be public, however
'Presence,' 'In Through the Out Door' and 'Coda' have all been remastered and re-released
Guitarist says the band can't agree on the right reasons to reunite
The song is alternatively titled 'If It Keeps On Raining'
Led Zeppelin guitarist lodged official complain against Williams over concerns for his own home
The song is a bonus track from the group's upcoming remastered reissue of 'Coda'