Charles Ives in the context of "Indeterminacy (music)"

The American Academy of Arts and Letters is a 300-member honor society whose goal is to "foster, assist, and sustain excellence" in American literature, music, and art. Its fixed number membership is elected for lifetime appointments. Its headquarters is in the Washington Heights neighborhood of Manhattan in New York City. It shares Audubon Terrace, a Beaux Arts/American Renaissance complex on Broadway between West 155th and 156th Streets, with the Hispanic Society of America and Boricua College.

The academy's galleries are open to the public on a published schedule. Exhibits include an annual exhibition of paintings, sculptures, photographs and works on paper by contemporary artists nominated by its members, and an annual exhibition of works by newly elected members and recipients of honors and awards. A permanent exhibit of the recreated studio of composer Charles Ives was opened in 2014.

David Wallis Reeves (February 14, 1838 – March 8, 1900), also known as D. W. Reeves or Wally Reeves, was an American composer, cornetist, and bandleader. He developed the American march style, later made famous by the likes of John Philip Sousa, and his innovations include adding a countermelody to the American march form in 1876. Sousa called Reeves "The Father of Band Music in America", and stated he wished he himself had written Reeves' "Second Regiment Connecticut National Guard March". Charles Ives also borrowed from the "Second Connecticut" on four occasions.

A tone cluster is a musical chord comprising at least three adjacent tones in a scale. Prototypical tone clusters are based on the chromatic scale and are separated by semitones. For instance, three adjacent piano keys (such as C, C♯, and D) struck simultaneously produce a tone cluster. Variants of the tone cluster include chords comprising adjacent tones separated diatonically, pentatonically, or microtonally. On the piano, such clusters often involve the simultaneous striking of neighboring white or black keys.

The early years of the twentieth century saw tone clusters elevated to central roles in pioneering works by ragtime artists Jelly Roll Morton and Scott Joplin. In the 1910s, two classical avant-gardists, composer-pianists Leo Ornstein and Henry Cowell, were recognized as making the first extensive explorations of the tone cluster. During the same period, Charles Ives employed them in several compositions that were not publicly performed until the late 1920s or 1930s, as did Béla Bartók in the latter decade. Since the mid-20th century, they have prominently featured in the work of composers such as Lou Harrison, Giacinto Scelsi, Alfred Schnittke and Karlheinz Stockhausen, and later Eric Whitacre. Tone clusters also play a significant role in the work of free jazz musicians such as Cecil Taylor, Matthew Shipp, and Kevin Kastning.

In music, a simultaneity is more than one complete musical texture occurring at the same time, rather than in succession. This first appeared in the music of Charles Ives, and is common in the music of Conlon Nancarrow and others.

Polystylism is the use of multiple styles or techniques in literature, art, film, or, especially, music.

Some prominent contemporary polystylist composers include Peter Maxwell Davies, Alfred Schnittke, and John Zorn. Polystylist composers from earlier in the twentieth century include Charles Ives and Erik Satie. Among literary figures, James Joyce has been referred to as a polystylist. On the other hand, composers including Sofia Gubaidulina have rejected the term as not applicable to their work.