NOTATIO

Fifth movement ("Cloudburst") of Grofé's Grand Canyon Suite.

EDIT: I just realized I had this score in my collection.

It just shows tied whole notes and dynamics.

I would only use the upside down version on a staff with multiple voices; otherwise it's always above the staff.

Only in piano music. I don't like the look of them even there, but pianists apparently can stand them.

I find that either B or D works for me. If I have a lot of quarter/crochet duplets I'm going to use dotted eighths/quavers for consistent readability.

These are what I'm currently using:

staff lines: 1/7 spaces
ledger lines: 1/5 spaces
barlines: 4/25 spaces
stems: 1/6 spaces

I also beefed up my slurs
slur end: 1/10 spaces
slur middle: 1/4 spaces

Yikes, then I would just assume that these are the sounding pitches and rewrite accordingly (touch-fourth natural harmonic on the D and G strings for the D and G, fingered B touch-fourth artificial harmonic on the G string for the B, and... open string E?).

Are there any recordings? Composer still alive? Known performers?

One would have to determine which octave the notes are meant to be heard; there's no way to get an E5 harmonic on a violin.

I'm partial to #4, #6, and #11.

I would love to include the resultant pitch, but it greatly muddies the page with too much information.