what is the meaning of a note that looks like a rhombus in a contrabass quartet arrangement?

[Kenneth Wolcott]

Hi Werner;

  Thank you for the explanation.  Sometimes multitasking results in
small chaos :-)

Thanks,
Ken

On Mon, Apr 17, 2023 at 10:21 PM Werner LEMBERG <wl at gnu.org> wrote:
>
>
> > what is the meaning of a note that looks like a rhombus in a
> > contrabass quartet arrangement?
>
> I don't know how many people are both on the MacPorts and the LilyPond
> mailing list (you sent this e-mail to the wrong one :-), so I'm going
> to answer that: These notes are 'flageolet tones', also called
> 'harmonics', i.e., you only slightly touch the string at the notated
> position.
>
> > I don't see anything mentioned in the Notation Reference regarding
> > this.
>
> There are index entries for both terms.
>
>
>     Werner