Clicky no work

This one should
Keith Harris interview
Session musicians are hired for the session and that is it.
Somebody like Cliff or Elvis usually get a royalty percentage that's on the 50 year limit.
The actual writers of the song get their percentage for life plus 70 years after they die - usually, some people have been known to sign that away though.
James Brown pulled a fast one by giving his daughters a co-writing credit to effectively extend the period. (I think he sued them to remove it at some point too, make your mind up Mr Brown

)
Anyway, I think Cliffs main concern is that he loses control over the use of his recordings, so your local Satanic Massage Parlour can use it in their radio jingle and all that sort of thing.
But having somebody conspicuously well off complaining about losing income didn't really win any hearts and minds did it.