Chris Martin doesn't belong on the list. It's all basic chords. Same with Edge. Basic stuff - but good sounding basic stuff.
I'll just make mine a top 5 (in no particular order):
Tori Amos
Ben Folds
Elton John
Billy Joel
Fiona Apple
I'll just make mine a top 5 (in no particular order):
Tori Amos
Ben Folds
Elton John
Billy Joel
Fiona Apple