Mamya - // The right on brigade.
It isn't relevant here. //
Thanks Mamya - I entirely agree.
You don;t get to build a reputation as a writer and musician of Elvis Costello's calibre by cow-towing to anyone.
I think Gromit is more than likely correct - all musicians get sick of singing the same hit song all the time, and want to ring the changes with new work.
Elvis Costello has earned the right many times over to sing what he wants, when he wants, and the notion that he is open to pressure from idiots who want to control artistic output is, frankly, nonsense.