As far as royalties are concerned, while Lennon, and the others in the group may no longer own the publishing rights, they still receive writers royalties, which are about 50%.
When you think of how many times a day a Beatles track or a cover is played round the world in any 24 hour period, this must amount to a tidy sum.
This according to Snopes is still being paid into John's estate. Ironically this last week on the anniversary of his killing was probably a nice little earner, as lots of their tracks were replayed.

Giok


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