Recitals of patterns
Erik Carlson, violin


Upcoming performances


A tone: 25 beats sustain, 16 beats rest; repeated 200 times at tempo 144 bpm

August 1, 2018. 7:00pm
House concert, San Diego


A series of 20-second durations, each systematically subdivided into 5 shorter durations with simple integer ratios
(1, 2, 3, 4, 5) (1, 2, 3, 4, 6) (1, 2, 3, 5, 6) (1, 2, 4, 5, 6) etc. (indicated by change of bow)

August 5, 2018. 7:00pm
House concert, San Diego


Each new bow is a new frequency corresponding to a the average pitch of a unique phrase of seagull calls
as recorded over a day in La Jolla cove

August 12, 2018. 7:00pm
House concert, San Diego


A series of randomly chosen permutations of 8 randomly chosen pitches in the range D4 - C#5 (duplicate pitches permitted)
A new set of pitches is chosen every 10 minutes

August 16, 2018. 7:00pm
House concert, San Diego


Past performances


Each minute, on the minute, (for 61 minutes), a tone
Duration of the tone begins at one second and increases by one second each minute

July 30, 2018. 7:00pm
House concert, San Diego


The eight points of a cube, through various rotations
mapped onto a pitch/time grid
June 25. 7:00pm
House concert, San Diego


Repeated shuffling of a deck of cards (starting with a new deck)
Each suit mapped to a string, each card to a pitch

July 23, 2018. 6:00pm
House concert, San Diego


During each minute number M,
a tone is sustained during seconds which are multiples of numbers 2 through M+1. The other seconds are rests

June 22, 2018. 7:00pm
House concert, San Diego


2-voice canon at the unison
Notes in voice 1 played every beat with a duration of half a beat, pitch is D4 or E4 (randomly chosen)
second voice enters after 9.5 beats

June 19, 2018. 7:00pm
House concert, San Diego


20000 beats
2 nearby frequencies (played on 2 strings) phase across each other 20,000 times
(performed with the aid of a computer)

July 15, 2018. 7:00pm
House concert, San Diego


A drone (open string) played against a pitch that oscillates (maximum of +/- a minor second from the drone)
The pitch of the oscillating note is an exact slowed-down replica of the waveform of the dyad being played
(performed with the aid of a computer)

June 12, 2018. 6:00pm
House concert, San Diego


2-voice prolation canons that are also palindromes
(each voice on a single pitch)

June 10, 2018. 7:00pm
House concert, San Diego


Just intervals corresponding to the time (hours and minutes)
the performance lasts from 20:05 to 20:59

June 4, 2018. 8:00pm
House concert, San Diego


2-voice canon at the 5th
Voice 1 notes randomly chosen from pitches D4 - A4. Voice 2 follows after 3 notes pitches A4 - E4
Each dyad sustained for a full slow bow

June 1, 2018. 4:00pm
House concert, San Diego


A series of randomly-created pitch/duration palindrones of varying lengths

May 28, 2018. 7:00pm
House concert, San Diego


Transcriptions of a table tennis ball falling down various stairwells

May 21, 2018. 6:00pm
House concert, San Diego


2-voice canon at the major second (each voice a single pitch)
Each beat, the line either sustains or rests (determined randomly). The 2nd voice enters after 10 beats

May 15, 2018. 7:00pm
House concert, San Diego


100 digits of pi in bases 2 through 100
using a simple digit to pitch mapping

May 10, 2018. 7:00pm
House concert, San Diego


2-voice canon at the major second (each voice a single pitch)
The voices alternate. A new pitch begins every 10 seconds
The duration of each pitch is randomly chosen from 1-20 beats at 120 bpm
The canon has a 10-note delay

May 8. 7:00pm
House concert, San Diego


Oscillations of a point on the surface of the water at La Jolla Cove
slowed down and mapped into pitch

May 6, 2018. 8:00pm
House concert, San Diego


2-voice duration canon at the major second (each voice a single pitch)
Voices alternate each tone without overlap or gap
Each note in the line has a randomly chosen duration 1-10 beats
Identical durations in the imitating voice with a 10 note delay

May 1, 2018. 7:00pm
House concert, San Diego


One million vibrations
320 Hz sustained for 52'05"

April 26, 2018. 5:00pm
House concert, San Diego


Deriving various commas
(greater/lesser diesis, pythagorean, syntonic, diaschisma, kleisma, schisma, ragisma, etc.)
performed with cellist Judith Hamann

April 8, 2018. 7:00pm
Bread and Salt, San Diego


Durations of a repeated pitch taken from an r/counting "tug of war" thread.
about

April 3, 2018. 6:00pm
House concert, San Diego


Ascending prime numbers in base 12
digits mapped to pitches

March 28th, 2018. 7:00pm
House concert, San Diego


Walking the Chartres labyrinth
pitch mapped to circuit, string mapped to quadrant, duration mapped to constant walking pace

March 21st, 2018. 6:00pm
House concert, San Diego


3 alternating pitches sustained for durations of breathing stages (in, out, rest)
as measured during an hour of my sleep.

February 17, 2018. 6:00pm
House concert, San Diego


2 alternating pitches sustained for durations of swash oscillations at a point in La Jolla Cove
measured during an hour the day of the performance

February 12, 2018. 7:00pm
House concert, San Diego


Alternating tone and rest (from Series for any Solo Player)
C#5 played for 20 beats at tempo 107 bpm and then rest for 7 beats at tempo 95 bpm. Repeat 162 times

January 23, 2018. 7:00pm
House concert, San Diego


Random pitches with various probability distributions
(normal, beta, exponential, erlang, chi-squared, etc.)

December 11th, 2017. 8:00pm
House concert, San Diego


From the tradition of change ringing, the Avalon Delight Maximus method
(applied to a chromatic scale)
about

November 27th, 2016. 6:00pm
House concert, San Diego


Bridge hands played out, taken from the New York Times bridge column
Each suit mapped to a string, each card to a pitch

October 2nd, 2017. 7:00pm
House concert, San Diego


Transcription of a dripping faucet

September 9, 2017. 7:00pm
House concert, San Diego


An oscillating pitch that is an exact slowed-down replica of the waveform of the note being played
(performed with the aid of a computer)

September 5, 2017. 7:00pm
House concert, San Diego


A series of notes in which the pitch of the Nth note is deterimed by the number of factors of N.
(Prime numbers are rests)

August 14, 2017. 8:00pm
House concert, San Diego


Various sorting algorithms used to sort randomized pitches into a chromatic scale
(merge, insterstion, quick, bubble, heap, counting, shell, comb, buecket, radix, etc.)

August 1, 2017. 7:00pm
House concert, San Diego


9th iteration Cantor Set as a rhythmic pattern on a single pitch

July 13, 2017. 7:00pm
House concert, San Diego


Different ways of dividing a 12-note octave into 6 unique intervals

June 28, 2017. 7:30pm
House concert, San Diego


Pitch collections based on the coefficients of the polynomials that have a root at -2

June 19, 2017. 7:00pm
House concert, San Diego


A softly sustained tone, amplified by the volume envelopes from a live feed of the waves at La Jolla Cove

June 4, 2017. 7:00pm
House concert, San Diego


Twenty 500-beat phrases in which the duration between tones is based on random entries from the Online Encyclopedia of Integer Sequences
(the source of the sequence is projected for the audience to see)
about

May 23, 2017. 7:30pm
House concert, San Diego


Harness sequences from classic 12-shaft weaving patterns

May 22, 2017. 7:00pm
House concert, San Diego


Transcription of a fly trapped in a box

May 3, 2017. 7:00pm
House concert, San Diego


Segments of various continuous mathematical functions mapped onto an octave (as a glissando)
(each function begins at (0, 0) and ends at (1, 12), played over the course of 1 minute)

April 29, 2017. 7:00pm
House concert, San Diego


A series of chess openings (with dyads indicating coordinates of moves)

April 18, 2017. 7:30pm
House concert, San Diego


Melodies based on various texts. One tone per word.
The pitch of each tone is determined by how many times the corresponding word has been used so far in the text

April 14, 2017. 7:30pm
House concert, San Diego


A series of 48-note all-interval rows

April 11, 2017. 6:30pm
La Jolla Public Library, San Diego


10000 repetitions of a single pitch

April 6, 2017. 7:00pm
Bread and Salt, San Diego


Towers of Hanoi
The three stacks represented by three strings, pitch up from the open string represents stack height, duration represents disk size

April 1, 2017. 7:30pm
House concert, San Diego


Counting - by drawing the numerals on the surface of the string with the bowhair

March 27, 2017. 7:30pm
House concert, San Diego


Sonification of long division
(on 2 strings: one for the answer, one for the remainder as they develop)

March 20, 2017. 7:00pm
House concert, San Diego


4087:6527:7169 polyrhythm
(on 3 pitches)

March 16, 2017. 7:00pm
House concert, San Diego


Various molecules
encoded in InChI, and translated into pitches using a simple mapping.

March 1, 2016. 7:00pm
House concert, San Diego


Measuring time: a system that divides the day into units in base 12
Each violin string maps the units at different orders of magnitude
4-note chords tell the time. (4 open strings at midnight)
Corresponding time-chords are played at various moments throughout the performance

February 20, 2017. 7:00pm
House concert, San Diego


A series of Knight's Tours through a simple pitch/duration grid

February 19, 2017. 8:00pm
House concert, San Diego


One dimensional cellular automata - Rule 110
in 2 parts:
-applied to a scale of pitches
-applied to a rhythmic pattern
about

January 17, 2017. 7:00pm
House concert, San Diego


The square root of 2 expressed in binary (1 = pizz open G string, 0 = no pizz)

December 13, 2016. 8:00pm
House concert, San Diego


Sets of 200 pitches generated by various methods of randomness and pseudo-randomness
(dice, atmospheric noise, mersenne twister, card shuffle, coin flip, xorshift, roulette wheel, lava lamp, middle square, etc.)

December 3, 2016. 7:00pm
House concert, San Diego


Spelling consecutive words from the dictionary using a simple letter-to-pitch mapping

November 19, 2016. 7:00pm
House concert, San Diego


Reverse and add process until palindrome on various numbers in base 12

November 1, 2016. 6:00pm
House concert, San Diego


Logistic map
The frequency of the pitch on each bow (f) is based on the frequency of the previous pitch (F):
f = {[(F - 330) / 330] * (1 - [(F - 330) / 330]) * (pi + 0.8)} * 330 + 330

October 21, 2016. 8:00pm
House concert, San Diego


Most common frequency (in the violin range) detected each day from a microphone outside my house
Monitored for one year
One bow = one day

September 15, 2016. 8:00pm
House concert, San Diego


A catalogue of notated ornaments from instrumental music of the last 500 years, arranged by contour and interval content

September 8, 2016. 7:00pm
House concert, San Diego


A sustained tone that rises in pitch 1 Hz each bow change

August 23, 2016. 7:00pm
House concert, San Diego


Random pitches and durations (played softly)
(derived from random.org's atmospheric noise algorithm)
about

August 3, 2016. 7:00pm
Low Gallery, San Diego


A sonification of the first 4000 prime numbers mapped onto a chromatic scale
(P mod 13)
about

July 22, 2016. 7:00pm
The silo at Bread and Salt, San Diego


Selections from Gaylord Yost's "Exercises for the Change of Position"
about

July 20, 2016. 7:00pm
The silo at Bread and Salt, San Diego


From the tradition of change ringing, the Palatino Surprise Maximus method
(applied to a chromatic scale)
about

July 18, 2016. 7:00pm
The silo at Bread and Salt, San Diego