David Foster has had quite an input of originally written songs of the second millenia (The Prayer being memorable)
So has Pierpaolo Guerrini.
How could Andrew Lloyd Webber not be in the list?
Nor Stock/Aitken/Waterman?
And even though very popsical, but with a self-developed style of chordal repetition, the second best selling group of all time behind the Beatles, is of course ABBA.
I would have thought the above would have some recognition in a list of best songwriters.
-m. 😉