daniel korenblum

@katchwreck.bsky.social

173 Followers 230 Following

computational & biomedical engineer/scientist. profile pic is from near Sinks Canyon in Wyoming, a natural water-slide (i had just slid down it and dropped off the edge when my friend Ryan took the pic, he was wading in the creek below the falls)

lead sheet for "Why Should I" by Bob Marley & the Wailers (1972), in the key of A Major

harmony chart for Lucy in the Sky with Diamonds (Lennon/McCartney)

1-page chart for "Mission in the Rain" by Hunter/Garcia

poster for jazz tribute show at Peacock Lounge (552 Haight St SF) on September 4 (advance tickets available at purplepass.com/jazztribute)

a "modal compass" diagram showing each mode as a tonewheel, representing the 12 equally-tempered chromatic pitch classes, arranged into two semi-circular arcs of wheels, one for descending scales (left) and another for ascending scales (right), with the inversion symmetry indicated by a mirror plane (vertical centerline).

root positions of all scales is at 12 o'clock, regardless of where their tonewheel appears along the arcs. NOTE: the root note *does not change* on this diagram! in other words, 12 o'clock on all pitch constellations represents the same note (e.g. a letter name, like C or A). t therefore, this picture aligns with a pitch-axis theoretic viewpoint, allowing modulations between diatonic scales with at least one tone in common to be considered in terms of alterations around a single note.

the inversion symmetry between pairs of modes, with dorian as its own inverse, can be seen by comparing the two pitch constellations at each vertical position.

the seven modes are arranged into sequences of single-note semitone alterations, using sharps for ascending scales (right) and flats for descending scales (left).

note that there is no single-note semitone alteration connecting the lydian and locrian modes, hence the disjoint arcs.

however, the lydian and locrian modes are connected by inversion symmetry, since descending lydian intervals and ascdending locrian intervals are identical (and vice versa).

the semicircular axes, from "dark/cold" to "light/warm", imprecisely convey an idea of how modulations between keys might be used to evoke particular feelings within a piece.

shading within each tonewheel represents tritone quality: dark gray indicates exact tritones (three whole steps), light gray indicates split tritones (two whole steps and two half steps). tritone angles shift & qualities alternate for each step along the compass' arcs.

flyer for a jazz concert on July 6, 2025 at the Musicians' Union Hall on 116 9th St in SF, CA

$10-$25 sliding scale

A virtual certificate with text "Celebrating 10M users on Bluesky, #169,077, daniel korenblum ‪@katchwreck.bsky.social‬, joined on Jun 28, 2023"