top note
Noun
Meaning
The most volatile parts of a perfume which are immediately perceived upon its application.
Synonym: head note
Coordinate terms: middle note, base note
(music) The highest note that can be produced by a certain instrument or singer.
(by extension) The best that a person can do; one's finest achievement.
Source: en.wiktionary.orgExamples
I can't leave the studio until everything is as it should be. And I can't put a record out unless I am completely happy with it. I never want to be at a signing and hear my album playing and think, 'Oh no, I could have done that top note better.'
They look for the top note to end every song. They don't know what they are singing about. There is no style.