New music and first tours Beginning in the early 1920s, Cowell toured widely in North America and
Europe as a pianist, with the financial aid of his former tutors — playing his own experimental works, seminal explorations of
atonality,
polytonality,
polyrhythms, and non-Western
modes. It was on one of these tours that in 1923, his friend
Richard Buhlig introduced Cowell to young pianist
Grete Sultan in Berlin. They worked closely together — an aspect vital to Sultan's personal and artistic development. Cowell later made such an impression with his tone cluster technique that prominent European composers
Béla Bartók and
Alban Berg requested his permission to adopt it. In a letter addressed to his friend on January 10, 1924, Cowell wrote, "I kicked up quite a stir in London and Berlin, and had some very good, and some very bad notices from both places." A new method advanced by Cowell during this period, in pieces such as
Aeolian Harp (1923) and
Fairy Answer (1929), was what he dubbed "
string piano" — rather than using the keys to play, the pianist reaches inside the instrument and plucks, sweeps, and otherwise manipulates the strings directly. Cowell's endeavors with string piano techniques were the primary inspiration for John Cage's development of the
prepared piano. In early chamber music pieces, such as
Quartet Romantic (1915–17) and
Quartet Euphometric (1916–19 ), Cowell pioneered a compositional approach he called "rhythm-harmony": "Both quartets are
polyphonic, and each melodic strand has its own rhythm," he explained. "Even the
canon in the first movement of the
Romantic has different note-lengths for each voice." In 1919, Cowell began writing
New Musical Resources, which was finally published after extensive revision in 1930. In the book, Cowell discussed the variety of innovative
rhythmic and harmonic concepts he used in his compositions (and others that were still entirely speculative). He talks about
harmonic series and "the influence [it] has exerted on music throughout its history, how many musical materials of all ages are related to it, and how, by various means of applying its principles in many different manners, a large palette of musical materials can be assembled." It would have a powerful effect on the American
musical avant-garde for decades after.
John Cage hand-copied the book and later studied Cowell, and
Conlon Nancarrow would refer to it years later as having "the most influence of anything I've ever read in music."
The Leipzig incident '' (1917), showing five-and-a-half
octave chromatic clusters to be played with both forearmsDuring his first tour in Europe, Cowell played at the famous
Gewandhaus concert hall in
Leipzig,
Germany on October 15, 1923. He received a notoriously hostile reception during this concert, with some modern musicologists and historians referring to the event as a turning point in Cowell's performing career. About a minute later, an angry group of audience members clambered onto the stage, with a second, more supportive group following. The two groups began shouting over and confronting one another, which eventually turned into
a large physical confrontation and riot on the stage, after which the Leipzig police were promptly called. Cowell later recalled of the incident, "The police came onto the stage and arrested 20 young fellows, the audience being in an absolute state of hysteria — and I was still playing!" The
Leipziger Neuste-Nachrichten additionally referred to his techniques as "musical grotesqueries". Comparisons were later made between this event and other riotous performances by experimental and futurist composers in Europe, including the
Paris premiere of Stravinsky's The Rite of Spring a decade earlier, and the performances of Italian futurist
Luigi Russolo.
Further experimentation debut Cowell's interest in
harmonic rhythm, as discussed in
New Musical Resources, led him in 1930 to commission
Léon Theremin to invent the
Rhythmicon, or Polyrhythmophone, a
transposable keyboard instrument capable of playing notes in periodic rhythms proportional to the
overtone series of a chosen
fundamental pitch. and the manic, cluster-filled
Tiger (1930), inspired by
William Blake's famous
poem. Much of Cowell's public reputation continued to be based on his trademark pianistic technique: a critic for the
San Francisco News, writing in 1932, referred to Cowell's "famous 'tone clusters,' probably the most startling and original contribution any American has yet contributed to the field of music." A prolific composer of songs (he would write over 180 during his career), Cowell returned in 1930–31 to
Aeolian Harp, adapting it as the accompaniment to a vocal setting of a poem by his father,
How Old Is Song? He built on his substantial oeuvre of chamber music, with pieces such as the Adagio for Cello and Thunder Stick (1924) that explored unusual instrumentation and others that were even more progressive:
Six Casual Developments (1933), for clarinet and piano, sounds like something
Jimmy Giuffre would compose thirty years later. His
Ostinato Pianissimo (1934) placed him in the vanguard of those writing original scores for percussion ensemble. He created forceful large-ensemble pieces during this period as well, such as the
Concerto for Piano and Orchestra (1928) — with its three movements, "Polyharmony," "Tone Cluster," and "Counter Rhythm" () — and the
Sinfonietta (1928), whose
scherzo Anton Webern conducted in Vienna. In the early 1930s, Cowell began to delve seriously into
aleatoric procedures, creating opportunities for performers to determine primary elements of a score's realization. One of his major chamber pieces, the
Mosaic Quartet (String Quartet No. 3) (1935), is scored as a collection of five movements with no preordained sequence.
New Music Society and impresario work of Cowell at the piano by American
cartoonist and illustrator
Harry Haenigsen, Cowell was the central figure in a circle of avant-garde composers that included his good friends
Carl Ruggles and
Dane Rudhyar, as well as Leo Ornstein, John Becker,
Colin McPhee, French expatriate
Edgard Varèse,
Ruth Crawford, whom he convinced Charles Seeger to take on as a student (Crawford and Seeger would eventually marry), and
Johanna Beyer. Cowell and his circle were sometimes referred to in the press as "ultra-modernists," a label whose definition is flexible and origin unclear (it has also been applied to a few composers outside the immediate circle, such as
George Antheil, and to some of its disciples, such as Nancarrow); Virgil Thomson styled them the "rhythmic research fellows." In 1925, Cowell organized the New Music Society, one of whose primary activities was staging concerts of their works, along with those of artistic allies such as
Wallingford Riegger and
Arnold Schoenberg — the latter of whom would later ask Cowell to play for his composition class during one of his European tours. Less than two years later, Cowell founded the periodical
New Music Quarterly, which would publish many significant new scores under his editorship, both by the ultra-modernists and many other composers, including Ernst Bacon,
Paul Bowles,
Aaron Copland,
Otto Luening and
Gerald Strang. Before the publication of the first issue, he solicited contributions from a then-obscure composer who became one of his closest friends,
Charles Ives. Major scores by Ives, including the
Comedy from
his fourth symphony,
Fourth of July,
34 Songs, and
19 Songs, would receive their first publication in
New Music; in turn, Ives provided financial support to a number of Cowell's projects (including, years later,
New Music itself). Many of the scores published in Cowell's journal were made even more widely available as performances of them were issued by the record label he established in 1934, New Music Recordings. (pictured) via
New Music Quarterly The ultra-modernist movement had expanded its reach in 1928, when Cowell led a group that included Ruggles, Varèse, his fellow expatriate Carlos Salzedo, American composer Emerson Whithorne, and Mexican composer
Carlos Chávez in founding the Pan-American Association of Composers, dedicated to promoting composers from around the Western Hemisphere and creating a community among them that would transcend national lines. Its inaugural concert, held in New York City in March 1929, featured exclusively Latin American music, including works by Chávez, Brazilian composer
Heitor Villa-Lobos, Cuban composer
Alejandro García Caturla, and the French-born Cuban
Amadeo Roldán. Its next concert, in April 1930, focused on the U.S. ultra-modernists, with works by Cowell, Crawford, Ives, Rudhyar, and others such as Antheil,
Henry Brant, and
Vivian Fine. Over the next four years,
Nicolas Slonimsky conducted concerts sponsored by the association in New York, across Europe, and, in 1933, Cuba. Cowell himself had performed there in 1930 and met with Caturla, whom he was publishing in
New Music. Cowell continued to work on both his behalf and Roldán's, whose
Rítmica No. 5 (1930) was the first free-standing piece of Western classical music written specifically for percussion ensemble. During this era, Cowell also spread the ultra-modernists' experimental creed as a highly regarded teacher of composition and theory — among his many students were
George Gershwin,
Lou Harrison, who said he thought of Cowell as "the mentor of mentors," and John Cage, who proclaimed Cowell "the open sesame for new music in America." Encouragement of the music of Caturla and Roldán, with their proudly African-based rhythms, and of Chávez, whose work often involved instruments and themes of
Mexico's indigenous peoples, was natural for Cowell. Growing up on the West Coast, he had been exposed to a great deal of what is now known as "
world music"; along with Irish airs and dances, he encountered music from China, Japan, and Tahiti. These early experiences helped form his unusually eclectic musical outlook, exemplified by his famous statement, "I want to live in the whole world of music." He went on to investigate
Indian classical music and, in the late 1920s, began teaching a course, "Music of the World's Peoples," at the
New School for Social Research in New York and elsewhere — Harrison's tutelage under Cowell would begin when he enrolled in a version of the course in
San Francisco. In 1931 a
Guggenheim fellowship enabled Cowell to go to Berlin to study comparative musicology (the predecessor to
ethnomusicology) with
Erich von Hornbostel. He studied
Carnatic theory and
gamelan, as well, with leading instructors from South India (P. Sambamoorthy), Java (Raden Mas Jodjhana), and Bali (Ramaleislan).
Imprisonment On May 23, 1936, Cowell was arrested in Menlo Park, California on a "morals" charge for allegedly having oral sex with a seventeen-year-old male. He was never accused by authorities of
pedophilia or molestation, but since the young men were typically referred to as "boys" at the time, incorrect assumptions were made by sensationalist newspapers and many in the public, severely damaging what public reputation he had along with the revelation of his homosexual activities. While jailed and awaiting a court hearing, he wrote a full confession accompanied by a request for leniency on the basis that "he was not exclusively homosexual but was in fact in love with a woman he hoped to marry". Suggestive letters and other artifacts were received from both Cowell and the young men who spoke to police, which were later used by the prosecution in his trial. In August 1937, after a parole hearing, the Board of Pardons fixed his term of incarceration at the maximum possible sentence, a decade-and-a-half. Cowell ultimately spent four years in
San Quentin State Prison, during a tumultuous era of the prison's history. Former warden Clinton Duffy would say it "had a reputation as one of the most primitive penitentiaries in the world." Physical abuse by wardens and officials was common for so-called "bad behavior", often via
whipping and
starvation. During his incarceration, several leading psychologists evaluated the composer according to now-disregarded theories of homosexuality, and later expressed faith in the idea of possibly "rehabilitating" the composer. Despite this time, Cowell taught music to fellow inmates, directed the prison band, and continued to write at his customary prolific pace, producing around sixty compositions. These included two major pieces for percussion ensemble: the Oriental-toned
Pulse (1939) and the memorably sepulchral
Return (1939). He also continued his experiments in aleatory music: for all three movements of the
Amerind Suite (1939), he wrote five versions, each more difficult than the last. Interpreters of the piece are invited to simultaneously perform two or even three versions of the same movement on multiple pianos. In the Ritournelle (Larghetto and Trio) (1939) for the dance piece
Marriage at the Eiffel Tower, he explored what he called an "elastic" form. The twenty-four measures of the Larghetto and the eight of the Trio are each modular; though Cowell offers some suggestions, any hypothetically may be included or not and played once or repeatedly, allowing the piece to stretch or contract at the performers' will — the practical goal being to give a choreographer freedom to adjust the length and character of a dance piece without the usual constraints imposed by a prewritten musical composition., where Cowell stayed incarcerated for four years Cowell had contributed to the
Eiffel Tower project at the behest of Cage, who was not alone in lending support to his friend and former teacher. He and other gay composers such as Aaron Copland and protégé Lou Harrison easily empathized about his persecution. Harrison said in 1937, "[the] prevailing lack of balanced perception in the great mass was never so wholly apparent to me before." Cowell's cause had been taken up by composers and musicians around the country, one of the most vocal of which was his former teacher and collaborator Charles Seeger. However, a few, including Ives, temporarily broke contact with him. Cowell was eventually paroled in 1940; he relocated to
Westchester County, New York, while under supervision, and resided with Australian ex-patriate composer and friend
Percy Grainger and his wife in
White Plains. Cowell was granted a pardon from California governor
Culbert Olson on December 28, 1942. ==Later life==