The phrase "a single note on" is correct and usable in written English.
It can be used when referring to a specific point or idea in a discussion, often in a musical or metaphorical context.
Example: "In her presentation, she emphasized a single note on the importance of teamwork."
Alternatives: "one point on" or "a specific note on".
This would explain the naturalness with which we understand, for instance, some early Warner Bros. cartoons, where a single note on a staff jumps from one line to another, thus creating a melody.
On this occasion, if I remember correctly, one work was a single note on a solo violin to be sustained for 1 hour 20 minutes (but the performance was abbreviated to 40 minutes).
He spent day after day playing a single note on the piano.
It begins with an eerie rumbling of the lowest strings and ends, whimsically, with a single note on the piccolo.
Tsubasa Hori is plucking a single note on the koto, finessing the rhythmic pattern Sawhney has specified, as well as teaching it to three dancers who are doubling up as singers and musicians.
She rides a tricycle around the living room while playing a single note on her harmonica, and then ruins Beezus and Henry's checkers game; she makes tin-can stilts with a friend and clatters around the neighborhood joyfully singing "One Hundred Bottles of Beer on the Wall".
Ms. Woodard portrays Elizabeth on a single note of angry, beleaguered dignity, but that note serves the play's purposes.
If the second series has a weakness, it's that Kingsley remains largely stuck on a single note of baffled bashfulness, although this may be the actor's preference, as it is the pitch he also hit in The Inbetweeners.
That this doesn't happen here has everything to do with Mr. Whitehead, who plays his character on a single note of authority edged in exasperation, something this actor's booming baritone conveys effortlessly.
If you analyse the complexity of the harmonic series of a single note played on a particular instrument – say a low E on a trombone – you find a teeming world of musical possibility.
Bel canto singing from the 17th through the early 19th century was built primarily on the recognition that the intensity of vocal tone on a single note may be increased or diminished.
