Definition of keynotes:
(n) :
A speech that sets the main theme of a conference or other gathering; a keynote speech or keynote address.
(n) :
The main theme of a speech, a written work, or a conference.
(v) :
(transitive) To deliver a speech that sets the main theme of a conference or other gathering.
(n) :
(music) The note on which a musical key is based; the tonic.