Interactive Educational Programs

**"Exponential Ensemble educational programs seamlessly integrate arts into science and math common core standards. They
provided an extremely engaging way for our students to make a powerful unknown connection."**

**Dana Taylor, Supervisor of Special Programs **

**Monticello School District (NY)**

Math teacher testimony

**"It teaches us a new strategy on how to add fractions
and it is fun to do. It is also a good review on fractions."**

**Mariana, 6th grader**

**The Computer School**

*“I was extremely excited
that my students who struggle with math were able to make a connection with the music and
apply it to solve more complex math fractions problems.”*

*Heather
Conklin*

*Math Teacher, RJK Middle
School*

**Bethel Woods ****E3 Residency**

**Engage - Experience - Explore **

**October 19 - 24, 2015.**

**During this special residency we worked with hundreds of middle school students
from the RJK Middle School in Monticello (NY). They learned how rhythm and fractions are closely related. Also, how J.S. Bach wrote a canon using different unit rates and geometrical
transformations. **

**Our Music & Physics Interactive Program (below) focused on the physics of
sound and the inverse relationship between frequency and wavelenght** (i.e. as you __increase__ the frequency, the wavelenght __decreases__.)

**For bookings, contact us at**

**exponentialensemble@gmail.com**

# 2014-15 Season

Thank you the NY Public Library (Bronx branch) for hosting us on January 8, 2015! We had a wonderful time!

The students learned how J.S. Bach transformed a melody by changing its rate and reflecting the melody onto its axis... They also created their own canon using the various options J.S. Bach composed.

**Coming up in January 2015, we will perform for students at The Cathedral School in Manhattan and members of the NY Public Library in the
Bronx.**

**For bookings, contact us via email:**

**exponentialensemble@gmail.com**

If you wish to make a fully tax-deductible donation towards our Music and Math Educational Concerts please visit our website: **www.exponentialensemble.com
and click on "Donate"**

Thank you so much for your support.

Exponential Ensemble

# 2013-14 Season

Instrumental Tuning Lectures with mathematician

Kevin Wilson and violist David Creswell.

**In order to understand the difference between different tuning system, we need to be able to hear slight differences within a half step.
**

**A half step is made of 100 cents and you should be able to hear a 2 to 10 cents difference between two pitches.**

**By taking the Adaptive Pitch Test, you will ear those differences.**

**Adaptive Pitch Test: http://tonometric.com/adaptivepitch/**

# Overtone series

**A sound is made of overtones. For example, the overtones of an open string can be heard by dividing it in 1/2, 1/3, 1/4. 1/5, 1/6, 1/7,
etc...**

**See below a demonstration by violist David Creswell.**

# Physics of sound

**Mathematician Kevin Wilson explained what sound is made of. Sound waves are created when air molecules are moving fast. The same
applies to a string, the air column in a wind instrument or the skin on a drum. **

**An air column vibrating.**

# Pythagorean Tuning

We measure the differences in pitch with **Cents**.

1 cent is 1/100 of a half step. So, there are 1200 cents in an octave.

In Pythagorean Temperament, the scale is made by stacking **pure fifths** on top of each other. But, the Pure Fifth, the best sounding fifth (when
you divide the string into 3 parts, also called the "Third Partial" ir second overtone), is at a ratio of 3:2 and actually **702 cents
up**. As we stack Pure Fifths, making our scale, we need to add **2
cents** each time, 12 times in a row (see circle of fifths).

**Problem**: As a result, one we return to the starting pitch, we end up 24 cents higher,
almost 1/4 of a half step!

# Equal Temperament

In **Equal Temperament**, all half steps are the same: each half step is 1/12 of an octave.
That way, we can go around the circle of fifths as many times as we want and end up at the same pitches. For example, to reach the fifth we go 7 half steps (or 700 cents) and the scale is
made by stacking these fifths on top of each other.

In practice, all fifths sound *just a little bit off* but at least it is mathematically equal.

# Well Temperament

Nowadays, ensemble without a piano or fixed-pitch instruments (string ensembles,
choruses, etc...) use **Well Temperament** made of Pure Fifths (3rd partial) and Pure thirds (5th partial).

Using this graph, we make all 12 notes of the western scale by moving in fifths and thirds up or down.

That way, we get the most combined resonance from the interaction of overtones while still being able to play in all keys. You can see (above) that any triangle will make a major or minor triad with a perfect 5th or 3rd.

# Warning

J. S. Bach's "Well-Tempered Clavier" **DOES NOT** refer to this system. We don't know what he was using for his
temperament, but there are various theories including one involving the "doodle" (below) on the front page of his manuscript.

# Kevin Wilson Mathematician

Kevin will help us develop a brand new Music & Math Program based on instrumental tuning theories, such as Pythagoras', along with violist David Creswell. We are excited to explore this unique and complex topic connecting music and math!

Kevin Wilson grew up on a dairy farm in Shelbyville, Kentucky. He began studying the piano at the age of four under the tutelage of his grandmother. But his other tutor was his father, who began teaching him about probability and baseball before he even remembers, and his Uncle Brian who gave him a copy of Visual Basic for his eighth birthday. To the betterment of the musical world, Kevin came slightly to favor mathematics (and, thanks to Brian, its computational aspects), earning a B.S. in the subject from the University of Michigan and a Ph.D. from Princeton. He is currently employed as a Data Scientist at Knewton, an education technology company in New York City, and concerns himself daily with modeling how students learn. In his spare time he co-directs a corps of volunteer software engineers and data scientists help non-profits in the City improve their technology infrastructure, remotely co-teaches Computer Science at Lee County High School in Kentucky, plays the piano occasionally, and works with Exponential Ensemble to develop interesting coursework at the nexus of mathematics and music.

# David Creswell Violist

**Violist David Creswell** will be collaborating with mathematician Kevin Wilson in develping a lecture series on instrumental tuning.
David has been performing in the New York area for more than 15 years as an orchestral, chamber, and studio musician, while also keeping a busy schedule as a soloist, teacher and music coach.
Mr. Creswell is Principal Violist of the Greenwich Symphony, the Long Island Philharmonic, and the NEPA Philharmonic. Mr. Creswell also frequently performs with the New York Philharmonic,
the New Jersey Symphony Orchestra, and the American Ballet Theater Orchestra, and the Mostly Mozart Festival. He is the former Principal Violist of the Sarasota Opera Orchestra in
Florida. As a chamber musician, Mr. Creswell has concertized with such renowned artists as
Kathleen Battle, Sidney Harth, and Anthony Newman, and is a founding member of the Larkspur Trio. His recordings include numerous film scores and popular releases as well as chamber music and
projects with music icons David Byrne, Rufus Wainwright, Erasure, Linda Thompson, and Rod Stewart. He was the violist for the original Broadway productions of the Tony Award nominated “Caroline, or
Change,” “The Color Purple,” “South Pacific” at Lincoln Center, Stephen Sondheim’s “Follies” from the Kennedy Center, and has played several seasons with the Radio Music Hall Christmas
Spectacular. He continues to collaborate on collegiate teaching projects for students of the Juilliard School with the renowned teacher Heidi Castleman. In 2010, Mr. Creswell soloed in
Mozart’s Sinfonia Concertante with the Long Island Philharmonic and concertmaster Erica Kiesewetter, and 2012 performed the Bartok Viola Concerto with the Greenwich Symphony.

**A word from Pascal Archer,**

**Founder of the Exponential Ensemble**

*"My father was a math teacher and, growing up, he taught
me that music and math have so much in common!" *

Music and mathematics have a lot in common but most of the time these two subjects are taught separately in school. For the Exponential Ensemble, it is our goal to collaborate with math teachers in making that connection possible for their students and, as a result, deepening their understanding of specific math concepts.

(below) Pascal Archer, founder and clarinetist, playing rhtyhmic combination against a steady beat on the drum. The students have to find which rhythmic combination from the list is being performed.