Which preposition to use with keynotes

of Occurrences 90%

It requires but one to strike the keynote of respect and personal freedom in marriage; the other will soon come into harmony.

to Occurrences 10%

"To stand on one's own feet" Heeren finds the keynote to the discourses of Demosthenes, as of Chatham.

for Occurrences 1%

He was prominently connected with every leading question, and upon all he struck what proved to be the keynote for the action of his party.

in Occurrences 1%

In all of these the administration of the respective internal secretions increases the burning up of material in the body, and all of them have a higher rate of tissue combustion than their confreres, with a subthyroid or subpituitary keynote in their cell chemistry, or with insufficient interstitial cell action.

Which preposition to use with  keynotes